Femitron
场发射电子微波管
🗣️ 情景例句
My mother has a touch of the flu.
我妈得流感了。
He tries to button his own shirt,but he can't do it.
他试着扣好他的自己的衬衫，但是他不能做到。
A short while ago, my sister helped me to carry one of my old bookcases up the stairs.
几分钟前，我妹妹帮我把一个旧书橱抬上了楼。