He pointed out that a play is not a static object like a picture.
他指出戏剧不像图片一样静止不动.
When object rub against each other, static electricity is produced.
当物体互相摩擦时, 静电就会产生.
I have here an object, mass m, muk friction coefficient kinetic is mu k, mu s and the static friction coefficient equals mu s.
有一个之质量为m物体,动力摩擦因数是,静摩擦因数,是。
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