除了兴趣知道何时何一管了，该代码组仍然可以提供有用的类型识别标记时，商业已成为难以辨认。

Apart from the interest of knowing when and where a tube was made, the code group can still provide useful type identification when the commercial markings have become illegible.

youdao

除了兴趣知道何时何一管了，该代码组仍然可以提供有用的类型识别标记时，商业已成为难以辨认。

Apart from the interest of knowing when and where a tube was made, the code group can still provide useful type identification when the commercial markings have become illegible.

youdao