An emoticon is a textual portrayal of a writer's mood or facial expression.符号表情)是书写者情绪或者面部表情的文字表现方式.We can use our eyes and facial expressions to communicate virtually every subtle nuance of emotion there is.我们用眼睛和面...
臭氧是一种非常活跃的氧气形态。Ozone is a highly reactive form of oxygen gas.臭氧由氧气和紫外线发生反应而产生。Ozone is produced by the reaction between oxygen and ultra-violet light.密封的飞机内很少需要补充氧气。Supplementary oxygen is rarely needed in pressurized ai...
一只鸽子从塔里钻出来，扑扑地拍打着翅膀。A pigeon emerges, wings flapping noisily, from the tower.把填料放到腔内，把鸟的腿和翅膀扎紧。Put stuffing into the cavity and truss the bird.她看见蛾子的翅膀偶尔会泛光。She saw the occasional glimmer of a moth's wings....