And the new president renewed that pledge at news conferences in London where he attended the G-20 summit Thursday and at a campaign-style town hall event in Strasbourg,France where he was preparing for the 60th anniversary NATO summit.

VOA: standard.2009.04.03

For example, we know that if a body is near the surface of the Earth, the force of gravity of that object seems to be m times g, where g is 9.8.

例如,我们知道,如果在地球表面有一个物体,该物体受到的重力大小为 m 与 g 的乘积,g 等于 9.8

耶鲁公开课 - 基础物理课程节选

The force, as this weight drops is constant, mgh and so the work is just going to be m g h, h where this is h.

当重物掉落时候的力是恒定的，因此做功就是，这段长度是。

麻省理工公开课 - 热力学与动力学课程节选

Mr.Ban said he has written to the G-20 members, outlining four areas where he thinks they must show leadership, including producing a "very substantial" international stimulus package in addition to their national ones, meeting their existing donor commitments and taking a firm stand against protectionism.

VOA: standard.2009.03.25

Where she is also the Bert G. Kerstetter professor of Politics and International Affairs.

她还是普林斯顿大学贝特·克斯特教授,主讲政治以及国际事务。

普林斯顿公开课 - 国际座谈会课程节选