求翻译：同时，自选任课老师也有许多弊端，例如。学生学不到比较全面知识，可能造成知识掌握的不全面，不利于他们的全面发展是什么意思？

Optional instructor has many disadvantages, for example. Students failed to learn a more comprehensive knowledge and may result in incomplete knowledge is not conducive to their full development

In addition, self-appointed teachers also has many drawbacks, for example. Student does not learn more comprehensive knowledge, knowledge may be caused by the incomplete, to the detriment of the overall development of their

At the same time, optional teaches classes teacher also to have many malpractices, for example.The student cannot learn the quite comprehensive knowledge, possibly creates knowledge grasping not to be comprehensive, does not favor their full scale development

At the same time, optional teacher also has many disadvantages, for example. Students learn to more comprehensive knowledge, could cause of incomplete knowledge, is not conducive to their full development

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