In this way it is able to know ----the things are and avoid bumping into them.While flying ,a bat makes a sound which hits things and comes back to its ears .

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In this way it is able to know ----the things are and avoid bumping into them.While flying ,a bat makes a sound which hits things and comes back to its ears .

In this way it is able to know ----the things are and avoid bumping into them.While flying ,a bat makes a sound which hits things and comes back to its ears .
In this way it is able to know ----the things are and avoid bumping into them.
While flying ,a bat makes a sound which hits things and comes back to its ears .

In this way it is able to know ----the things are and avoid bumping into them.While flying ,a bat makes a sound which hits things and comes back to its ears .
是要翻译吧?
“就是靠这种方法,(蝙蝠)知道前方是什么东西并且避免撞上他们.”
“在飞行的时候,蝙蝠发出一种声波;这种声波打到前方物体上并反弹至蝙蝠耳中.”

idon't understand what are you ask for..