waste head

By using waste soldering materials from electronic factories, the author succeeded in preparating a kind of tin soldering wire containing copper, which is of very little erosion effect on the copper head of soldering iron and thin copper wire.

作者利用电子工厂失效焊料研制成含铜焊锡丝，该焊丝对铜烙铁头和微细铜丝有较小的熔蚀性。

Not continuous cleaning business card printing head to clean up the insoluble waste.

不需要通过连续清洗制卡头来清除不能溶解的废物.

Anybody gullible enough to waste ￡ 395 on a box and then be prepared to wear it on their head, deserves to be laughed at

我的结论是：任何蠢到花395英镑买这个箱子套在头上的人，活该被耻笑。

There are still peaceful ways to cut the snakes head off, but you and people like you have so far to go in your education that even bring up things like Nullification would be a waste of time.

还是有和平解决大鳄问题的办法，不过，对于你和像你那样没知识的人来说，说这些都是浪费时间。