怎用英语表达：才怎么怎么样怎么用表达 “才.”的意思,比如说：只有小明来了,我们才能出发.再比如：等雨停了,我们才离开.

not……until
等雨停了，我们才离开：We didn't leave until it stoped raining.
只有小明来了，我们才能出发：We won't depart until Xiao Ming comes.

we can't leave until the rain stop
until xiao ming comes ,we can go .
or
we can't go until xiaoming comes

not .until
we won't start until xiaoming comes
we won't leave until the rain stops

until