例句與造句

1. if the shield current, i2 is equal and opposite to that in the center conductor, the center-conductor field and the shield field will cancel, producing a zero net field
   如圖18，圖中屏蔽體上的電流與電纜芯線中的電流大小相等、方向相反，于是由這兩個(gè)電流感應(yīng)出來(lái)的磁場(chǎng)將相互抵消。
2. It's difficult to find net field in a sentence. 用net field造句挺難的