点火线圈初级绕组。电流通过线圈，产生一个电磁场，用来在次级线圈中产生高电压。
Ignition coil primary winding. Current flow through the coil produces an electromagnetic field, which is used to induce a high voltage in the secondary coil.
点火回路按惯例可分成两部分，一部分是初级线圈(低压回路)，另一部分是次级线圈(高压回路)。
The ignition circuit can conveniently be divided into two parts. One park is known as the primary windings (low-tension circuit) and the other part is the secondary windings (high-tension circuit).
点火系统分为两条回路：初级和次级。
The ignition system is divided into two circuits: the primary and the secondary.
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