And he also says the dire assessment of the security situation by General Stanley McChrystal, the new U.S.and NATO commander in Afghanistan, has presented senior officials with an issue they did not expect.

VOA: standard.2009.10.16

There has to be the mathematical model, which I just presented, but it may be more complicated.

还必须有我之前讲的数学模型,但实际模型可能更复杂

耶鲁公开课 - 金融市场课程节选

Oh, they are. And at the moment there is a bill that I think over the past couple of years has been presented to the legislator.

是的，现在,就有这样一个法案，在几年前,人们把它提交给了立法者。

普林斯顿公开课 - 人性课程节选

Former U.S.Secretary of State Madeleine Albright has just finished chairing a team that did a first draft of the Concept, and presented it to NATO officials in May.

VOA: standard.2010.06.11

The antigen has to be presented to helper T-cells, those helper T-cells have to stimulate a B-cell population to both proliferate and differentiate.

抗原需要被呈递给辅助性T细胞,这些辅助性T细胞需要激活B淋巴细胞,使其增殖和分化

耶鲁公开课 - 生物医学工程探索课程节选