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2. Don’t assume turning off Wi-Fi will always help.
2.关闭Wi-Fi不总是有用
A common suggestion for extending battery life is to disable Wi-Fi. However, if you’re in range of a strong Wi-Fi signal, your phone uses less energy to connect to the Internet with a Wi-Fi connection than a cellular one. If you regularly use apps that rely on your location, having Wi-Fi enabled helps your phone determine its location without having to rely solely on power-hungry GPS features, so it actually helps a battery last longer.
一个关于省电的常见建议是关闭Wi-Fi。然而，如果你所在的地方Wi-Fi信号很强，相比蜂窝网络连接，手机使用Wi-Fi就可以用很少的电量连上网络。如果你经常使用和位置有关的应用，打开Wi-Fi就可以让手机检测到自己的位置，而不是仅仅依赖非常耗电的GPS功能，所以这对省电也有帮助。
An exception is when you’re at the edges of a Wi-Fi network, where your phone is struggling to get a good connection, and you have a good cellular data connection. But in most cases, you’re usually better off keeping Wi-Fi enabled.
不过，如果你正处于Wi-Fi网络覆盖的边缘，手机努力想得到更好的连接，而且此时蜂窝网络数据连接良好，这种情况下例外。但是在大多数情况下，最好还是让Wi-Fi开着。
