整个模型是建立在已有网络协议的基础上，并且采用了概念分层结构。
The whole model is created on the network protocol and adopts the concept layered structure.
在模型基础上，用分层序列法对培养基组成及浓度进行优化。
On the basis of the models optimization of the cultural medium is made.
这种分层次的土地市场体制是建立城市土地储备制度的制度基础。
This reform of land market is the institutional base of building urban land reserve system.
中等职业学校学生英语基础差距较大，解决此问题的最好办法是实施分层次教学。
There is a big difference of English basil knowledge among the students in vocational school.
中等职业学校学生英语基础差距较大，解决此问题的最好办法是实施分层次教学。
There is a big difference of English basil knowledge among the students in vocational school.
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