Further analysis indicated that external copper pollution was the major cause of the crack in the bent pipe.

进一步分析，认为外来铜污染是引起弯管开裂的主要原因。

youdao

Further analysis indicated that external copper pollution was the major cause of the crack in the bent pipe.

进一步分析，认为外来铜污染是引起弯管开裂的主要原因。

youdao