The Athenians were invaded by an army from the outside, and Codros led his forces out against them.

雅典人遭到外敌入侵,寇德罗斯率军迎敌

耶鲁公开课 - 古希腊历史简介课程节选

They began laboring to suppress and laboring to stamp out forces that opposed them, whether those forces were on the right or on the left.

他们开始努力超越,努力毁灭反对他们的力量，不管这些力量是左派还是右派。

耶鲁公开课 - 弥尔顿课程节选

Well, you could think about the cell wall of a bacterium as its skeleton, it's what protects it from mechanical forces that are out in the world.

你可能认为细菌的细胞壁,就像骨骼一样,使其免受,外界机械力的伤害

耶鲁公开课 - 生物医学工程探索课程节选

The physicist has to constantly find out what forces act on bodies.

物理学家必须,不断地寻找都有哪些力作用在物体上

耶鲁公开课 - 基础物理课程节选