英语词汇但不是很有用是什么意思，但不是很有用的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-觉斋网

单词	但不是很有用
释义	DEFINITIVE EXAMPLES 权威例句〔HELP〕He bought a book on relaxation techniques but it wasn't very helpful. 他买了一本讲各种放松方法的书，但不是很有用。朗文写作活用
随便看	extraction cylinder extraction factor extraction feed extraction flap extraction flow extraction fractionation extraction heater extraction indicator extraction instruction extraction jack extraction kinetics extraction of cataract extraction of copper extraction of cubic root extraction of glue extraction of oil extraction of oil extraction of oil extraction of root extraction opening extraction packed column extraction parachute extraction plant extraction pump extraction raffinate

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