如果一个坏人把一个扳手扔到机器上，那么传送带所带的轮齿序列显然可能被改变，比如从红-蓝-蓝变为红-绿-蓝。

If a villain throws a wrench into the machine, the sequence of cogs carried along the conveyor belt could change visibly - say from red-blue-blue to red-green-blue.

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有客人时我们可以把这张沙发改变为一张床。

We convert the sofa into a bed when we have guests.

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如果你可以改变你的想法把悲观变为乐观，你可以改变你的生活。

If you can change your mind from pessimism to optimism, you can change your life.

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