During these activities, an important communicative tool is the third angle projection drawing which is seldom used in China.
在这些活动中，重要的交流工具反而是我国原来使用很少的第三角投影图。
During these activities, an important communicative tool is the third angle projection drawing which is seldom used in China.
在这些活动中，重要的交流工具反而是我国原来使用很少的第三角投影图。
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