narrower topic（narrower）

大家好，我是小房，我来为大家解答以上问题。narrower topic，narrower很多人还不知道，现在让我们一起来看看吧！

1、sorry, it is difficult to get the meaning of " narrower cast". could you give us the environment?narrower maybe is precision. cast maybe is a kind of material for casting.。

本文到此讲解完毕了，希望对大家有帮助。