Petrol can be chosen at the flick of a switch.

【switch】只要按一下按钮就可以选择汽油。

Since the 1980s, with satellite TV and the Internet, it has been possible to listen to British and American English at the flick of a switch.

自上世纪80年代，随着卫星电视和互联网的进入，轻敲开关就可以了解英式和美式英语。

Love can then turn into savage attack, feelings of hostility, or complete withdrawal of affection at the flick of a switch.

然后， 爱会变成野蛮的攻击、敌意的感觉，或者一按开关就完全放弃感情。

All cars will be powered by electricity, solar energy or wind, and it will be possible to change the color of cars at the flick of a switch.

所有的汽车部将由电能、太阳能或风能提供动力，并且只要轻轻按一下开关就能够改变汽车的颜色。