The process of heat transfer is a non-stable process because the oil temperature in truck is decreased with the elapse of time.
由于罐车内石油温度是随时间衰减的，因此传热称之为非稳定过程。
With elapse of time, the turbulent vicissitudes in the land of China in over 100 years diminished this historical records into oblivion.
春去秋来，百多年来中国大地风起云涌，这段历史记载渐渐被淹没了。
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