external magnetic field的用法和樣例：
例句
- Now consider applying an external magnetic field to the hydrogen atom.
現在考慮加一外磁場於氫原子。 - In other words, each domain is spontaneously magnetized to saturation even in the absence of any external field.
換句話說，即使在沒有任何外磁場的情況下，每個磁疇也自發地磁化到飽和。 - When exposed to an external magnetic field, these spinning "bar magnets" attempt to align their axes along the lines of magnetic force.
當這些自旋的磁鐵棒暴露在外部磁場中時，它們就試圖將自己的軸線按照磁場力的方向排成直線。
