The machine is of very poor design是主系表吗,这里的be of是什么情况?有什么类似句型吗

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The machine is of very poor design
是主系表吗,这里的be of是什么情况?有什么类似句型吗

确实是主系表结构
of poor design 是固定短语 相当于形容词 设计的很糟糕的
of +adj +名词 都有形容词与之对应,也就是说,这是个形容词性短语,一般只做表语和后置定语
例如：of（great）value=valuable 有价值的
of great importance=important 重要的
of benefit=beneficial 有益的
of no interest=not interesting 无趣的
of use=useful 有用的
等等

举个例子：
it is of great danger (be of + noun)
it is very dangerous (be + adjective)

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