Marey's law

例句：

1. 1. The principle ofMarey's law states that thespeed of a particle is proportional to itsmass and inversely proportional to itscharge.
   马雷定律的原理是，粒子的速度与它的质量成正比，与它的电荷成反比。
2. 2. This law has been widelyapplied in various fields such asphysics, chemistry, and biology.
   这一定律已被广泛应用于物理学、化学和生物学等领域。
3. 3. In order to understand the behaviorof particles, scientists must study the relationshipbetween their motion and the forces acting onthem.
   为了理解粒子的行为，科学家必须研究它们运动与作用在它们上的力的之间的关系。