Similarly the positively charged proton has a negatively charged antiparticle, the antiproton.同样的,带正电荷的质子具有其带负电荷的反粒子—即反质子.This sister particle is usually called an antiparticle.姐妹粒子通常称为反粒子.This property, often called " h...
Kids nowadays love to eat junk food every day.现在的小孩每天都喜欢吃速食.How often do you eat junk food?你多久吃一次无营养食品?What kinds of junk food do you eat?你吃什么样的无营养食品?...