How many hours a day the pump needs to be operated depends on the season and how much water is needed for crops.

VOA: special.2009.08.17

If it is a lab it will include the lab instructions and often all the tools if there are software tools that are needed for that lab.

如果是实验室，将会包含实验指导,如果需要软件工具的话,还会提供工具。

麻省理工公开课 - 媒体、教育、市场课程节选

The biggest thing for me on that path is I needed to draw something out and I needed to get it out of my head.

在我看来，这条路上最重要的莫过于,是需要描绘出一些东西,再把它们忘却。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

Calcium is needed for nerve and muscle cells to work normally.

VOA: special.2009.04.21

This mineral is needed for normal growth and development.

VOA: special.2009.11.17

Vitamin K is needed for healthy blood.

VOA: special.2009.04.21

He says their research has identified an "Achilles' heel" of the parasite - an enzyme that is needed for the parasite's survival.

VOA: standard.2010.04.05

"Strong support is needed for them to rebuild their lives,". "The Mauritanian national refugee organization and its partners are assisting in the reintegration process with a variety of programs allocating farm land, providing Arabic and French language courses, doing medical screening of the returnees,etc."

VOA: standard.2009.10.24

The company is also supporting the costs of the satellite bandwidth needed for the connections.

VOA: special.2009.02.16

He says a less costly, easy-to-use medicine for sleeping sickness is badly needed.

VOA: special.2010.04.07

is focused on training that will enhance capabilities needed for humanitarian and civic assistance, disaster relief, and regional security.

VOA: standard.2009.10.20

Third party processing could ensure the material is enriched only to the point needed for civilian purposes, and below the level called for in nuclear weapons.

VOA: standard.2009.10.04

The changes were needed for the shuttle to leave the station before the arrival of a Russian Soyuz rocket, which is set to launch on March 26.

VOA: standard.2009.03.15

He says an cheap and easy-to-use medicine for sleeping sickness is badly needed.

VOA: standard.2010.04.05

Under the scheme, Russia would further enrich the uranium to the 20 per cent purity needed for use in a research reactor in Tehran which produces medical isotopes but is running out of fuel.

VOA: standard.2009.10.24

"To close this important gap in our regulatory structure, legislative action is needed that would subject all systemically-important financial institutions to the same framework for consolidated supervision that currently applies to bank holding companies."

VOA: standard.2009.10.01

"It would be unethical for us to turn our back on these people and not conduct the research that is so desperately needed to develop the drugs to treat these diseases and the vaccines to prevent them in the future."

VOA: standard.2010.02.16