他为裁军运动和反对核武器扩散而奔走。He campaigned for peace and against the spread of nuclear weapons.原油泄露后的浮油很快在水面上扩散开来。A crude oil slick quickly spreads out over water.有关于分子扩散速度的数据。There are data on the rates of diffusion of molecules....
You don't have to worry about me. I'm a good swimmer.你不用担心我。我水性很好。All kids her age do silly things; it's nothing to worry about.她这个年龄的孩子都会做傻事，根本不用担心。Don't you worry about them when they're out of...