Unless it is compelled to change that state by forces impressed upon it.
除非有外力加诸其上，迫使其改变状态。
"Every body continues in its state of rest... Unless it is compelled to change that state by forces impressed upon it" (Isaac Newton).
“每一个物体保持其静止状态…除非有加于其上的力，它才会改变那种状态”(伊萨克·牛顿)。
Every body continues in its state of rest, or in uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it.
物体都保持静止的或沿一条直线作匀速运动的状态，速运动的状态，除非作用在它上面的力迫使它改变这种状态。使它改变这种状态。
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.
每一个物体都保持它自身的静止的或者一直向前均匀地运动的状态，除非由外加的力迫使它改变它自身的状态为止。
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.
每一个物体都保持它自身的静止的或者一直向前均匀地运动的状态，除非由外加的力迫使它改变它自身的状态为止。
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