Climbers have to pull themselves straight up the face of very high rocks or walls.

VOA: special.2009.12.09

And up in the other extreme are elements with very high average valence electron energy.

和那些特别元素,它们具有很好的平均价电子能。

麻省理工公开课 - 固态化学导论课程节选

The interesting thing is that through time, as political winds change, these taxes have changed and they've gone up to some very high levels in the past in the United States and other countries.

有趣的是在不同时期,如果政策方向有所转变,税率也会改变,在过去的美国和其他国家,税率曾经相当高

耶鲁公开课 - 金融市场课程节选