The male gamete could not unite with the female.雄配子不能与雌配子结合.Gametes may develop without fertilization, or meiosis may substantially precede gamete formation.配子不经过受精也可能发育,若减数分裂先于配子形成,配子也可能发育.Objective : To investigate the...
我出门上街并拉上了门。I let myself out into the street and pulled the door shut.我这人非常孤僻，从不出门。I'm very much a loner — I never go out.我走出门，竖起衣领抵御冷雾。I stepped outside and pulled up my collar against the cold mist....
...bedridden persons confined to the supine position.那些只能平躺在床上的久病不起的人。He had to spend two years bedridden with an injury.他因伤不得不卧床两年。With two children bedridden the mother was ill at ease.两个孩子病得躺在床上,母亲非常焦急.It is especiall...
Only in this way can the critical mass of participation be reached.只有这样才能凑足参与人数。Each year, hundreds of animals are killed in this way.每年都有数百只动物被这样杀掉。In this way we get better results in teaching.这样我们的教学效果就比较好了....