He unfastened the straps on the cases.他解开了手提箱上的带子。

Ted knows how to fasten and unfasten his seat belt.特德知道怎样系上和解开安全带。

I unfastened my bra.我解开了胸罩。

I unfastened the lock.我把锁开开了。

He unfastened the latch on the gate.他拉开了门闩。