zero-focus-current gun

枪械的英文_百度知道 ... writing gun 写入电子枪, 录贮电子枪 zero-focus-current gun 聚焦极零电流电子枪 bullet 子弹 ...

... well-focussed beam 高聚焦束 zero-focus-current gun 聚焦电极零流电子枪; 聚焦电极零流电子枪 zone focus 区域调焦 ...