涂料气孔;针孔

blacking hole的用法和样例：

例句

Flux Corrosion is typified by pin hole leaks, generally in the bottom of a horizontal line.典型例子是由于针孔泄漏导致的焊剂侵蚀，通常发生在水平管道的底部。

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学英语单词

Bosporus, Kingdom of the

ceramic pigment