题目内容
机械零件丧失预定功能或降低到许用值以下的现象，称为机械零件。
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Sketching traditionally refers to a preliminary rough type ofdrawingthat an artist might make in preparation for either apaintingor a more formal drawing.
Formally however it is a useful way for an artist to capture a fleeting impression of a scene or person before it changes.
For this purpose, it is typically executed rapidly and with little concern for accuracy.
They portray the inner identity of the artist and are more difficult sometimes to copy as a result than a finished work.
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