The advanced learner can use her skills to assist the lower-level learner. The lower-level learner is able to learn from the more advanced learner.

高水平学习者可利用其能力帮助低水平学习者，而低水平学习者则能从高水平学习者处学到很多。

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This prevents the advanced students from getting bored and also prevents the lower-level students from becoming nervous or tense when they realize people have finished their assignments before them.

这样既可以防止高水平学生感觉厌烦，又不会使低水平学生在看到有人完成作业时感觉着急。

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These more advanced shells not only lower the training requirements for users, but they also simplify the use of increasingly powerful (and higher level of abstraction) commands.

这些高级的shell不仅降低了使用难度，而且还简化了日渐强大的(以及更高的抽象层上)命令的使用。

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