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....
Many of the clothes come from the world's top fashion houses.这些服装中有很多出自世界顶级时装设计公司。The final word will still come from the Secretary of State.最后仍然要由国务卿来定夺。Nearly 60% of our bookings come from repeat business and pers...