Practically every river has an upper, a middle and a lower part.
事实上每条河都有上游、中游和下游。
Practially every river has an upper, a middle and a lower part.
事实上每条河都有上游、中游和下游。
Every river has an upper, a middle and a lower part.
每条河都有上游、中游和下游。
A test of lower middle temperature blackening on steel part was introduced.
介绍了钢铁件低中温发黑工艺试验。
A test of lower middle temperature blackening on steel part was introduced.
介绍了钢铁件低中温发黑工艺试验。
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