air-coil

基本解释

One immediate benifit of having "air coils" is obviously the complete lack of cogging, which, if used in a windmill should result in a machine that starts very easily.
一个直接的好处有“空气弹簧”显然是完全没有脉动，而如果使用风车应导致机器，开始变得非常容易。
The air in the garden was warm and fragrant.
花园里的空气一片温馨。
The archers sent their shafts through the air.
弓箭手向空中射出利箭。
The lack of air in the room make everyone sniffle.
屋子里空气缺乏，使得每个人都频频吸气。
If a coil has no metal core it has an air core.
如果线圈没有金属芯子，它就有一个空气芯子。