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...
Despite their bitter screen rivalry, off-stage they are close friends.虽然他们在银幕上是誓不两立的对手，在现实生活中却是至交。a fierce rivalry for world supremacy夺取世界霸权的激烈竞争The quarrel originated in rivalry between the two families.这次争吵是两家不和引起的....
before的近义词有：ago, before,before, in front of, in the front of。下面这两个副词均含"……以前"的含义：ago ：指从现在起往前推算一段时间，始终置于所修饰的词之后，与一般过去时连用。before ：或指从过去某一时间起向前推算的若干时间的以前，通常与过去完成时连用；或泛指以前，并不具体指若干时间以前，可使用现在完成的或过去时；还可指从将来某一时间起的若干时间以前。下面这些前置词(...
Application of the cis - trans test defines the genetic unit of function, the cistron.顺? 反 测验可以用来确定遗传的功能单位――顺反子.Rockwell Automation defines sustainable production as cleaner, safer more energy - efficient operations.罗克韦尔...