a plane is a machine that can fly 为什么用TAHT

a plane is a machine that can fly 为什么用TAHT
a plane is a machine that can fly 为什么用TAHT

a plane is a machine that can fly 为什么用TAHT
宾语从句的引导词 用来引导 can fly

that 作主语 表物

定语从句，用that或which引导皆可

也可以用which 当先行词为物时 用that which 都可以