她正试图在头上平衡一本书。

She was trying to ___balance a book on her head.

火烈鸟优雅地用一条腿保持平衡。

The flamingoes ___balanced gracefully on one leg.

如果你必须带很多东西，最好把它们放在车里，而不是在自行车上平衡它们。

If you have to take many things with you, it will be better to carry them in your car, rather than ___balancing them on your bicycle.