I choose to wrap the DAO in an interface, so I can switch my data access layer to use different persistence strategies.

我选择将这个dao封装在一个接口中，这样我就能够切换数据访问层来使用不同的持久性策略。

youdao

These counters are maintained automatically at the storage layer without requiring any switch.

这些计数器将在存储层上自动维护，不需要进行任何切换。

youdao

The second switch is from a JNI layer to a kernel space.

第二个切换是从jni层到内核空间。

youdao

That light switch introduces a middle man, a layer of separation between the action and the thing you really want to work on, which is the light.

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Gnodal acts as what is called a switch fabric, essentially an aggregator of other Layer 2 switches in the network.

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