We are still very far from explaining how photochrome acts on a cellular or molecular level . 关于光敏色素怎样在细胞水平或分子水平上发生作用，我们现在还远远不能解释。
In a dynamic situation the vector sum of the forces acting on the body vanished as in the static case . 在动力学状态下，作用在物体上的力的矢量和与静力学情形一样化为零。
This, acting on the spongy weakened asperities, will allow the surfaces to interact with minimal damage . 这层东西作用在松软的微凸体上，将使相互作用表面的损坏危险减至最小。
He had lived and acted on the assumption that he was alone, and now he saw that he had not been . 他过去的生活和行动都基于他只是一个人独来独往这个假设上，现在他看出并非如此。
The motion that results when forces act on a material system depend also on mass distribution in the whole system . 物体系统受到力的作用所产生的运动也取决于在整个系统中的质量分布。
The idea of an inverse-square law of gravitational force acting on the planets was in the air around newton's time . 认为作用于行星的是平方反比定律的引力，这种看法在牛顿时代很流行。
In the most general case, a single force acting on a body produces a change in both its translational and rotational motions . 在最普遍的情况下，单一的力作用在物体上，使物体的平动和转动都发生改变。
Acting on the contention that facts are sacred, reports can cause untold suffering to individuals by publishing details about their private lives . 记者从尊重事实这个观点出发，将某些人的私生活细节公诸于众可能给他们带来极大的痛苦。
