four-level emitter 四能级放射体
three-level light emitter 三能级光发射体
level emitter
水平发射器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Today, the best that can be said is that the extent and duration of future EMP-induced blackouts would depend on whether the emitter generates a small or large pulse, and whether it is detonated at ground-level or from high altitudes.
CENTERFORSECURITYPOLICY: The Blackout Next Time
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