To map 100 mutants by this method would necessitate nearly 5,000 crosses.用这种方法来绘制100个突变型的遗传图就要做5000个杂交.Earth crosses the orbit of Halley's Comet annually in October.地球和哈雷彗星的轨道将于每年的十月份交叉.All the morning wreaths and c...
我试着在等候室里写作文, 但我办不到.I kept trying to write my paper in the waiting room, but it was too hard.就因为这个才没人在等候室聊天, 对 吗 ?This is exactly why people don't talk to each other in waiting rooms, right?我们被领进一间等候室,里面排列着坐上去不太舒服的椅子...