"Something had to be grown in rotation with corn." Scott Jackson, professor of plant genetics at Purdue University.

VOA: standard.2010.02.01

Because positing them allows you explain things about the rotation of the star or the gravitational fluctuations, what have you.

因为这样假定能帮助你解释,诸如星体运行,引力波动,等现象

耶鲁公开课 - 死亡课程节选

Actually, the view of vectors we take nowadays is that vectors are associated with a pair of numbers which, on the rotation of axes, transform like this.

实际上,今天我们讲矢量所用的观点是,矢量是和一组坐标值相对应的,在坐标轴旋转的过程中像这样变换

耶鲁公开课 - 基础物理课程节选

The vote was seen as a major setback for Mr.Topolanek as it came just days before a planned visit by United States President Barack Obama and midway through the rotation of the Czech Republic's European Union presidency.

VOA: standard.2009.03.25