他们研究吸热的原理.They work on a principle of heat absorption.此过程是吸热的,同时很快发生碳积沉并使催化剂活性减低.This process is endothermic with rapid carbon deposition and deactivation of the catalyst....
詹尼弗·哈特是个喜欢无事自扰的 中产阶级 妇女.Jennifer Hart was a fussy, middle - class woman.詹尼弗失望地把她的网球拍扔在地上.Jennifer flung her racquet down in despair.当球拍从包裹布下露出来时,詹尼弗发出了一声喜悦的惊叹.Jennifer uttered an exclamation of pleasure as his racquet em...
I need some children's crayons.我需要一些儿童蜡笔.The little girl was coloring pictures with crayons.这个小女孩正在用蜡笔在图画上涂颜色.Children enjoy colouring, eg with crayons.儿童都喜欢涂颜色(如用蜡笔)....