西部可能会有一段天气晴朗的日子。There is a chance of sunny spells in the West.那个凉爽而晴朗的早晨让他异常兴奋。He felt strangely exhilarated by the brisk, blue morning.雾已经散了，看来是温暖晴朗的一天。The fog had lifted and revealed a warm, sunny day....
The body must return identically to its original condition when the loads are released.当去掉载荷时,物体必须恢复到与原来完全一样的状态.The motion is periodic, which means it occurs identically over and over again.这个运动是周期的, 意即运动以同样的形式重复出现.The w...