Only in later tests would you ever set the switch to return the "real" DAO.
只有在后面的测试中才会将开关设置成返回“实际”DAO。
Climate change can flip the switch, but it's not the only cause.
气候变化可能会触动这个转换开关，但这决不是唯一的原因。
The only question, then, is why don’t they switch?
现在的问题是，既然如此，他们为何还不改变运营商呢?
An event object is like a switch: it has only two states: on or off.
一个事件对象如同一个开关：它仅有两种状态：开和关。
Re-enter the command, but use each switch only once.
重新输入命令，但每个开关都仅使用一次。
The voltage stress of each main switch is only half of the input voltage.
其主开关管的电压应力均为输入电压的一半。
Therefore, we only need to buy a switch.
因此，我们只需要买一台交换机。
Therefore, we only need to buy a switch.
因此，我们只需要买一台交换机。
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