They also have a block oxide finish to protect from corrosion.

他们也有一个块氧化物完成防止腐蚀。

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Note: The only place you need to do a double knot is at the start and finish of the paper block.

备注：在开头和结尾的地方，必须打两个结。

youdao

Note: The only place you need to do a double knot is at the start and finish of the paper block.

备注：在开头和结尾的地方，必须打两个结。

youdao