World Health Organization officials say it could be months before a vaccine is available to treat this latest strain of flu.

VOA: standard.2009.04.28

So even though he's very closely connected to the legacy of avant-garde modernism, he's also connected to a social realist strain, the naturalist strain.

虽然怀特,与前卫现代主义的传承，有千丝万缕的关联，但他仍具有现实主义。

耶鲁公开课 - 1945年后的美国小说课程节选

He's connected to both those strains as well as the modernist strain.

怀特同时具备两种特征,但我先不去区分。

耶鲁公开课 - 1945年后的美国小说课程节选

Meanwhile,expedited efforts are going forward on several continents to develop an effective vaccine for the new strain of influenza.

VOA: standard.2009.04.30

Now, you don't have to buy that and individuals undoubtedly found the strain too much from time to time, but what's interesting, is rather the ideal, the claim, the theory.

你不必非得接受这些理论,况且现代社会常充斥着个人主义倾向,但是那些理想,主张和理论却更意味深长

耶鲁公开课 - 古希腊历史简介课程节选

Each year,scientists work to develop a unique influenza vaccine to protect people against the strain expected in the coming flu season.

VOA: standard.2010.07.21

"We had a new strain of flu. We did not really know that its lethality was going to be.

VOA: standard.2009.05.03

But the current swine flu is a new strain to which humans have no immunity and against which existing vaccines offer no protection.

VOA: standard.2009.04.30

But he says it is cause for concern because it is a new strain, and people have not built up an immunity to it.

VOA: standard.2009.05.01

Environmentalists are trying to encourage Sierra Leone's salt producers to use other methods, including drying salt in the sun, to reduce the strain on mangroves.

VOA: standard.2010.03.29

The speed and magnitude of the crisis surprised the government and aid agencies and has put an enormous strain of their ability to provide assistance.

VOA: standard.2009.07.03

Hundreds of millions braved the cold winter weather to travel home to be with their families, putting a great strain on the country's transport system.

VOA: standard.2010.02.14

"This is a new strain of stem rust organism that has the power to destroy most of the wheat varieties being grown around the world."

VOA: standard.2009.09.16

It's a virulent strain that occurs when a person with TB fails to complete the six to nine-month course of medication or catches TB from another person who is ill with a drug resistant-strain.

VOA: standard.2010.07.12

"The target would be to have this vaccine ready for the fall flu season, so that in addition to being vaccinated for the flu, you would be able to be vaccinated for this strain.

VOA: standard.2009.04.30

This is welcome news for U.S.health officials, who initially had to consider the possibility that the new flu strain's impact could mirror the devastation of the 1918 influenza pandemic that led to tens of millions of deaths worldwide.

VOA: standard.2009.05.03

To slow the spread of the virus and relieve the strain on the country's health system, the government has set up a national pandemic flu service, where people who suspect they're infected can get a diagnosis and prescription for antiviral drugs over the phone or Internet.

VOA: standard.2009.07.31

The official number is secret, but news reports say the general wants about The request is controversial, not least because with the U.S.troop level in Iraq expected to remain around its current 120,000 for at least several more months, the strain on the U.S.Army is considerable.

VOA: standard.2009.10.13