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 land is our mother, the rivers our blood. We must protect her, for she is our life.
Every performance is a new beginning.
The past is always tense, the future perfect.