你只需要一次性按下全部电源按钮。
作为一个计时器，它和1978年左右的电子表差不多：屏幕平时是黑的，好像在保存果汁一样，所以你需要按下电源按钮才能查看时间。
As a timepiece, it's comparable to digital watches circa 1978: the screen is usually in a black, juice-conserving state, so to check the time you need to press the power button.
你需要它们来给你的设备提供电源、连接设备，但是你想让他们出现在你看不见的地方。
You need them to power your devices and connect peripherals but you want them out of sight.
应用推荐