如果你用透明盖子将玻璃罐盖上，跳蚤将继续跳跃，想挣脱玻璃罐的束缚，一次又一次碰壁，但是它依然坚持撞击！

Now if you put a clear lid on that jar, the flea will continue to try to get out. It keeps jumping up to escape… only to keep whacking its head on the lid of the glass jar.

youdao

如果你用透明盖子将玻璃罐盖上，跳蚤将继续跳跃，想挣脱玻璃罐的束缚，一次又一次碰壁，但是它依然坚持撞击！

Now if you put a clear lid on that jar, the flea will continue to try to get out. It keeps jumping up to escape… only to keep whacking its head on the lid of the glass jar.

youdao