炭黑是不透明的,可以防止辐射热传到推进剂内部.Carbon black is an opacifier which prevents radiant energy transmission to the interior of the propellant.研究了纳米炭黑水泥砂浆的导电性和电热特性.Research of the nano carbon black cement mortar electrical and electro...
我见到过这个身着灰色套装的英俊男士。I saw this nice-looking man in a gray suit.他的灰色针织毛衫和长裤全都被雨水淋透了。His grey jersey and trousers were sodden with the rain.这幢楼刷的是浅灰色的灰泥，看上去有些陈旧。The building was of greyish plaster and looked old....
In old age the two men wrote each other wistful letters.这两个人晚年时互通信函，诉说怀旧感伤之情。He has a wistful look.他神情沮丧。The statue has a gentleness, an ambience, a wistful elegance.那尊雕像具有一种柔和 、 一种独特格调 、 一种忧郁沉思的雅致....