The greatest danger to American agriculture is the loss of the family farm.

筹划洋人的事情一定要先了解洋人的情况，要了解洋人的情况一定知道洋人的情况。

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

石油和天然气公司的角色正在演变，我们必须随之改变。