一个机器人学会了骑自行车。

A robot learned to ride a bike.

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你一旦学会了骑自行车，就永远忘不了怎么骑。

Once you know how to ride a bike you never forget it.

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虽然女孩多次跌倒了，但是，最后，女孩学会了骑自行车。

Though the girl has fallen many times, the girl can ride the bike finally.

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虽然女孩多次跌倒了，但是，最后，女孩学会了骑自行车。

Though the girl has fallen many times, the girl can ride the bike finally.

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