钢扣的英文：
steel fastener

steel是什么意思：
n. 钢铁；钢制品；坚固
adj. 钢制的；钢铁业的；坚强的
v. 钢化；使冷酷

Good adhesion to steel, galvanized steel and aluminum alloy.
对钢铁、锌钢材及铝合金有良好的附着力。

Steel and gasoline are industrial products.
钢和汽油是工业产品。

The towers are surfaced with steel plates.
在塔面上加了一层钢板。

The steel rolled out in plates.
钢轧成了钢板。

He is a steel king.
他是钢铁大王。

fastener是什么意思：
n. 扣件；钮扣；按钮

The sail is fastened to the yard with tiers.
船帆用系绳紧紧绑在帆桁上。

There is no sense in fastening on that pretext of yours.
一味强调你那个借口是没有用处的。

Can you fasten the lid on this box?
你能把这个盖子固定在这个盒子上吗?

That rope was fastened to the tree.
那根绳子被缚牢在树上。

He shut the case and fastened the straps.
他关上箱子并系牢带子。