Spokesman Robert Gibbs said the address was simply meant to give students a boost at the start of a new school year.

VOA: standard.2009.09.08

Some, like the smallpox vaccine on one exposure generates a very high response that lasts for many years so you don't need a boost.

有一些疫苗,比如接触一次天花疫苗后,人体就能产生高水平的免疫应答,并持续很多年,所以无需再次接种

耶鲁公开课 - 生物医学工程探索课程节选

If this was tetanus, you got this tetanus vaccine when you were young; you get a boost every five or ten years because your antibody levels are starting to fall.

以破伤风为例,小时候,你接种过破伤风的疫苗,每隔五年或十年要再接种一次,这是因为体内的抗体浓度会下降

耶鲁公开课 - 生物医学工程探索课程节选

The election will help shape Iraq's immediate future, either allowing sectarian and ethnic divides to deepen or giving more nationalist forces a boost.

VOA: standard.2010.03.07

But the problems can grow much faster than you can get a performance boost out of the computer.

对，电脑运行速度是很快,但是问题的规模增长的。

麻省理工公开课 - 计算机科学及编程导论课程节选

But Arporn says that Thailand's overall economy will get a boost from strong export growth - up between three-point-five to four percent compared to 2009.

VOA: standard.2010.03.27

You have to inject it multiple times because the first blip that you get in immune response is not very high, you have to boost and often you have to boost again in order to get a high enough response to be protected.

你必须得进行多次注射,因为第一次注射,无法使免疫系统产生强烈反应,你得要增强免疫,通常还得再增强一次,以使反应足够强烈,从而起到保护作用

耶鲁公开课 - 生物医学工程探索课程节选

Southeast Asia led the region's recovery with a boost in arrivals of 15 percent.

VOA: standard.2010.02.04

President Obama got the most applause from opposition Republicans when he said the number-one focus in the coming year would be on creating jobs and giving a boost to small businesses.

VOA: standard.2010.01.28

The car sector could get a further boost later this month when Tata Motors launches its much-awaited Nano car.

VOA: standard.2009.03.13

To get at these non-mutating parts of the virus, Nabel and his colleagues used a two-step vaccination process, called "prime-boost."

VOA: standard.2010.07.21

Adding room and food charges and fees at renowned universities can boost the bill as high as $50,000 a year!

VOA: standard.2009.12.10

Japanese stocks fell Wednesday, a day after the central bank approved a new lending program to boost the country's stagnant economy.

VOA: standard.2009.12.03

But Immigration reform advocates maintain a legal path to citizenship for undocumented workers will help boost the U.S.economy.

VOA: standard.2010.04.12

Chechen President Ramzan Kadyrov said the end of the operation would boost the local economy and declared a holiday to celebrate the event.

VOA: standard.2009.04.16

Africa Command officials say the command has a far softer approach, trying to boost security through greater cooperation and capacity-building activities with America's African partners.

VOA: standard.2009.10.20

Nigerian Information Minister Dora Akunyili told reporters a range of measures have been introduced to boost security at airports in response to the failed attack.

VOA: standard.2009.12.28

Their campaign was given a major boost by Britain's first ever televised debate last week;

VOA: standard.2010.04.23

Earlier this year, the president challenged the private sector to join with government in a nationwide effort to boost student achievement in science and mathematics.

VOA: standard.2009.11.24

The British government, which has also closed its embassy there, is hosting a conference later this month designed to boost Yemen's ability to fight terrorism.

VOA: standard.2010.01.03

Economists say a weaker euro could boost European exports, but make U.S.products more expensive.

VOA: standard.2010.05.17

The New York Democrat said the embargo gives Cuba's rulers a scapegoat for their mistakes and lifting it will boost the U.S.standing on the world stage.

VOA: standard.2009.05.06

Currently,they can be held seven days. And it would boost from 120 days to two years the time a suspect can be held before being brought to trial.

VOA: standard.2009.09.10

On broader themes, Mr.Obama announced a U.S.initiative to boost lending and spur economic growth and recovery in the Americas, and proposed a hemispheric partnership to tackle energy and climate challenges.

VOA: standard.2009.04.17

But,in the meantime, people are beginning to drift back into Port-au-Prince, amid concerns that the opportunity to rebuild a less crowded capital and boost the rural economy may be fading.

VOA: standard.2010.07.16

By living at home,they will spend That's half the typical cost at a four-year state school, and a fraction of a private university's Adding room and food charges and fees at renowned universities can boost the bill as high as $50,000 a year!

VOA: standard.2009.12.14

The first step uses a bit of influenza DNA to get the patient's immune system to begin fighting off the flu, and then the protection is given a "boost" some time later by the second step, which can be either another bit of DNA or a conventional flu vaccine.

VOA: standard.2010.07.21

In a first reaction the EU's executive branch, the European Commission, said it was confident the Czech Republic could continue to "effectively preside over the European Union" despite the government losing a no-confidence vote in Prague Tuesday's vote of no confidence came after the opposition said the government came to late with a stimulus package of over three billion dollars to boost the ailing economy of this Eastern European nation.

VOA: standard.2009.03.25