number of windings

例句：

1. 1. The new circuithas a higher efficiency than the old one.
   新电路的效率高于旧电路。
2. 2. Thecoils on the transformer are madeof copper.
   变压器上的线圈由铜制成。
3. 3.The number of turns in the motor determines its speed.
   电机中线圈的匝数决定了其速度。