external 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(chǎng)于氫原子。 - In other words, each domain is spontaneously magnetized to saturation even in the absence of any external field.
換句話(huà)說(shuō)，即使在沒(méi)有任何外磁場(chǎng)的情況下，每個(gè)磁疇也自發(fā)地磁化到飽和。
