In fact, if they power down, they must change to vehicle mode first.

实际上，如果它们关闭，它们必须先切换到汽车模式。

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To illustrate the advantages of using the design pattern, imagine that after a while, these robots have discovered that they shouldn't power down while being in robot mode.

为了演示使用设计模式的优点，假定不久以后，这些机器人发现它们不应在处于机器人模式时关闭。

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So to cut down on energy, the MacBook is equipped with features such as more efficient power supplies and enhanced sleep mode.

因此，为了节能，MacBook装配了更高效的电源和功能更强大的休眠模式。

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