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单词	L-tryptophan
释义	L-tryptophan noun L-tryp·​to·​phan ˈel-ˈtrip-tə-ˌfan  : the levorotatory form of tryptophan that is a precursor of serotonin and was used formerly as a dietary supplement especially to promote sleep and relieve depression Word History First Known Use 1949, in the meaning defined above Medical Definition L-tryptophan noun L-tryp·​to·​phan ˈel-ˈtrip-tə-ˌfan  : the levorotatory form of tryptophan that is a precursor of serotonin and was formerly used in some health food preparations in the belief that it promoted sleep and relieved depression see eosinophilia-myalgia syndrome
随便看	be riding for a fall be riding high be rough on be rough on (someone) be rough on someone be run off one's feet be run/rushed off one's feet be rushed off one's feet be secure in the belief be secure in the belief/knowledge be secure in the knowledge be shot of be sick be sickening for be so bold be so kind be sold out be spoiling for be spoken for be starved be starving be starving/starved be stream national park be struck by be struck on

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。