Esiatron
靜電聚集行波管
??? 情景例句
Philip and I were living with Grandma and Grandpa. Philip
與我和爺爺， 奶奶住在一起。
Is it serious?
我的病嚴重嗎？
Yes, it is an old photo of my family.
是的，是我們家的一張老照片。