Revex
直齒錐齒輪粗拉法
??? 情景例句
Nets for tennis and badminton and so on.
有網球和羽毛球用的網等等。
At open doors dogs come in.
狗從開著的門中進來。
Indeed, we lack practice and experience nowadays in dealing with primitive conditions.
確實，我們今天缺乏對付原始環境的實踐和經驗。