婴儿哭闹时，妈妈解开了他连体衣的按扣。

The mother ___unsnapped the baby's onesie when he started crying.

她迅速解开了狗链，让狗狗自由奔跑。

She quickly ___unsnapped the dog leash to let the dog run free.

她轻轻一拉，纽扣就随着轻柔的声音解开了。

She pulled gently and the button ___unsnapped with a soft sound.