在导学群模式下，导学员的角色是多重的，职责是多方面的。
In the mode of Learners' Guidance Group, the role and responsibility of the guiding learning attendant are various.
构建导学群网络教学环境是开展现代远程教育的前提和基础。
Construction of network teaching environment of "Guiding Leaning crowd" is the prerequisite and basis of launching modern distance education.
试验的三种透水率桩坝，其导流效果与实体丁坝群的基本相同，并未因部分透水及形态不同而使其控导作用明显减弱。
Three kinds of permeable pile dikes with different seepage rate are tested, and effect of flow control is basically the same with the spur dike.
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