If it is placed on the floor or flat ground, all it can do is to shuffle about helplessly and, no doubt, painfully, until it reaches some slight elevation from which it can throw itself into the air.

如果被放在地板或平坦的地面上，它就只会无助地挪动，毫无疑问这样很痛苦。除非它到了稍高的位置，有了落差，才可以立刻闪电般地起飞。

youdao

If it is placed on the floor or flat ground, all it can do is to shuffle about helplessly and, no doubt, painfully, until it reaches some slight elevation from which it can throw itself into the air.

如果被放在地板或平坦的地面上，它就只会无助地挪动，毫无疑问这样很痛苦。除非它到了稍高的位置，有了落差，才可以立刻闪电般地起飞。

youdao