monad
n. 单子；单孢体；单细胞生物；一价物；单轴
例句
It's not a monad, but what is it?
这不是一个单子，但它是什么？
As always, the IO monad is special and difficult to reason about.
一如既往，IO单子是特别困难的原因有关。
We haven't used the state monad, but there are lots of other useful monads.
我们没有使用过state monad，但是用过许多其他很有用的monads。
