我听取了各年龄段人们的意见。I had comments from people in all age groups.我们的大多数听众都属于25至39岁这个年龄段。Most of our listeners are in the 25-39 demographic.轮滑对各年龄段的人而言都是一种很好的运动。Rollerblading is great for all ages....
平台上的警卫吹响了哨子.On the platform, the guard blew his whistle.裁判吹响了比赛结束的哨音。The referee blew his whistle for full time.裁判吹响哨子，比赛才算结束。The game's not over till the ref blows the whistle....
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.Aspergillus Oryzae mutants . High pressure seems an efficient approach for mutagenesis.继各种化学制剂、各种射线诱变等方法之后, 高压不失为一种行之...