Rationing had put an end to a surfeit of biscuits long ago.定量供应很久以前就结束了饼干过剩的状况。The time has come to put an end to the conflict.结束冲突的时候到了。Only a political solution could put an end to the violence.只有政治解决方案才能终结暴力。...
钙通过尿液和粪便排出体外。Calcium is excreted in the urine and stools.幼虫会连同粪便排出.The larvae may be excreted in the faeces.粪便含氮，而正是氮可以肥化荒芜的土地。The faeces contain nitrogen and it is that which fertilises the desert soil....
These chromosomes are so simple that some geneticists prefer to call them chromonemes.这些染色体结构简单,许多遗传学家喜欢称它们为染色丝.Geneticists believe that man's physical fitness has been degraded.遗传学家认为人类的体能一直在退化.Geneticists only rec...