It's the duty of the police to preserve the public order.(英译中)
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A若物体产生位移,则必定同时产生变形
B若物体各点均无位移,则必定无变形
C物体的变形与位移取决于外力的大小和方向
D位移的大小取决于物体的变形和约束情况
Press this button to start the engine.(英译中)
What a pretty little garden!(英译中)
A soldier's courage is put to the proof in battle.(英译中)