蝙蝠在夜间利用回声定位来导航。

___Bats use echolocation to navigate at night.

她突然大笑起来，看起来有点疯疯癫癫的。

She suddenly burst into laughter, looking completely ___batty.

他对足球疯狂热爱，每场比赛都不落下。

He's ___batty about football and never misses a game.