Lung cells die and are replaced about once a week.肺细胞约每周新老更替一次。Their indecision has been replaced by confidence and steely determination.他们的优柔寡断已经被自信和钢铁般的决心所取代。At last the sobs ceased, to be replaced by sniffs.最后，啜泣终于止住了...
The line went dead. Whitlock replaced the receiver...线路中断了，惠特洛克把听筒放回原处。They replaced trams by buses.他们用公共汽车代替了电车.Cuts in funding have meant that equipment has been kept in service long after it should have been replaced....
他们曾在一处泉边停歇休息。They had stopped by a spring to refresh themselves.棕榈泉有高档的餐厅和奢华的夜生活。Palm Springs has ritzy restaurants and glitzy nightlife.这口泉号称从不干涸。The fountain is reputed never to dry up....
Dopamine is an important neurotransmitter.多巴胺是一种重要的神经传递素。Neuroblastomas are also associated with increased urinary levels of dopa, dopamine and their metabolites.成神经细胞瘤患者尿中也出现大量的多巴 、 多巴胺以及它们的代谢物.Dopamine also plays a rol...
In 1900 Frank Chapman , an ornithologist, suggested a count instead of a kill at Christmas time.1900年, 一位鸟类学家FrankChapman建议人们在圣诞节时观测鸟类而不去狩猎它们.[ Man On P . A . ] Ladies and gentlemen, Happy chapman.女士们先生们, 我是快乐查普曼.Chapman...