The cock is the harbinger of dawn.雄鸡报晓.The crow of the cock is a harbinger of dawn.鸡啼报晓.The November air stung my cheeks, a harbinger of winter.11月的空气刺痛了我的脸颊,预示着冬天就要来临。The cuckoo is a harbinger of spring.布谷鸟预告春天的来临.Money...
He was determined to track down the cause of food spoilage.他决心查出食品腐烂的原因.The principal methods of avoiding spoilage are the use of pure yeast strains as starters.防止啤酒变坏的主要方法是用纯酵母菌株发酵.Food spoilage problems occur with mini...