twofold purchase双倍复滑车
twofold advantage双重好处
twofold classification双重划分
twofold action双重作用
twofold integration二重积分
twofold whirl复合旋流
twofold integral二重积分
twofold connotation两重涵义
ADJ（形容词） You can use twofold to introduce a topic that has two equally important parts. 有两部分的 [正式]
The reason for the interview is twofold: we want to find out what he can tell us, plus we also want to find out what condition he is in.
这一采访的原因有两个：我们既想看看他能告诉我们些什么，也想弄清他的处境如何。