primary flow的用法和樣例：
例句
- With the primary current increasing, the induced emf will be in the reverse direction to that of the current.
隨著(zhù)初級電流增加，感應電動(dòng)勢會(huì )與電流方向相反。 - When the secondary circuit is open, the core flux is produced by the primary current only.
當次級電路開(kāi)路時(shí)，鐵芯磁通量?jì)H僅由初級電流產(chǎn)生。
