Minute fragments of shoot apices are proverbially difficult to culture.微小的茎尖切段通常是难以培养的.This concept has now been replaced, for stem apices, by the tunica - corpus theory.此观点目前已经被原套原体学说所取代....
...avoiding the volleys of gunshot.躲开一排排子弹She hit most of the winning volleys.她的截击球大多都成功得分了。His timing when he volleys is so good.他截击空中球的时机掌握得很好。It's still not known how many died in the volleys of gunfire...现在还不知道有...