如果物体处于静止状态或作匀速直线运动,只要没有外力作用,物体将保持静止状态或匀速直线运动状态。
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
The only limit to our realization of tomorrow will be our doubts of today.
阅读的习惯是唯一没有掺杂任何杂质的享受;当所有其他乐趣消失时,它依然存在。