Most metal and plastic parts are designed to be manufactured, which means they can be clunky and contain material surplus to the part's function but necessary for making it.
大多数金属和塑料是为了生产而设计的，这就意味着它们会很重，并且含有与生产有关，但与其功能无关的剩余物。
The first batch of plastic parts finally came out, assembled with other metal test parts, doing the 1st time function test.
第一批的塑胶零件终于试出来了，与其他试做的零件组成第一支笔做功能测试。
The first batch of plastic parts finally came out, assembled with other metal test parts, doing the 1st time function test.
第一批的塑胶零件终于试出来了，与其他试做的零件组成第一支笔做功能测试。
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