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...
In the 1790s Tom Paine taught plebeian radicals that mankind would live in harmony were it not for the vested interest which princes, diplomats and soldiers had in promoting wars to enrich themselves.汤姆·潘恩在18世纪90年代教育平民激进...
由于车轴已经凉了,弗兰克扔下了它.Frank abandoned his axle as the heat in it died.他得去修理大车, 给车轴涂油.He had to repair the wagon, grease the axles.他们焊接断了的车轴.They weld the pieces of a broken axle....
I’d never met such crudity before.我从未见过这样粗鲁的行径。Despite the crudity of their methods and equipment, the experiment was a considerable success.尽管他们的方法和设备较为粗陋，那次实验却相当成功。I'd never met such crudity before.我从未见过这样粗鲁的行径.He...