physical home button的意思|示意

And the new nano's small size means that, unlike on iOS devices, there's no physical Home button.

而且新款nano的小尺寸意味着它不同于iOS设备那样，它没有物理的主按键。

Hit the physical home button, and each app currently running is displayed in a small Card window. Swipe left or right to switch between the Cards.

点击主按键后，一个小的卡式窗口中就会显示当前正在运行的程序，这时就可以随意地向左或向右选择卡片，也就是选择程序。

He told the magazine that the home button of the prototype was not a physical press button.

原型机的返航键不是物理按动按钮。