Extremely Limited User. Conveys and understands only general meaning in very familiar situations.

水平极有限，在极熟悉的情况下，只能进行一般的沟通理解。

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And the realization of user-mapping function also takes a lot of time and manpower to develop a drawing control, and the functions of it are extremely limited.

对于用户自绘制功能的实现，更是需要花费大量时间和人力开发绘图控件，而且功能极为有限。

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