Unless they are with an adult, children are not allowed to swim in the pool.

问题描述:

Unless they are with an adult, children are not allowed to swim in the pool.
为啥要用Unless 而不是Although呢? 谢谢

除非有家长陪同,才能游泳.
如果用although就是:虽然有家长陪同,但是孩子还是不能在泳池游泳.意思不太符合常理.