请问a part of和part of的区别在课外阅读上经常看到的是part of而不是a part of,part应该是可数名词吧,如果不加不定冠词a也应该加个定冠词the吧,那它们有什么区别?ps:刚才稍微查了一下,有人说a part

part of和a part of的区别? part of 与 a part of全部的区别a part of 和 part of的区别,要全的, Part of 和a part of 和parts of的区别 part of 和a part of有何区别? part of 和a part of有何区别? a part of them 和part of them哪个对 part of和a part of有什么区别? as a part of和as part of一样吗? a part of the part of part of 区别 part of 与 a small part of 的区别 A set of 和 a part of的区别是什么? part of 和 a part of 各自的用法 请给出句子示例 part of 和 a part of 在用法上的区别? is part of 和is a part of 的区别?Filing the clippings is part of the daily work of a secretary.此句话中应该是 is part of 还是 is a part of 请问a part of和part of的区别在课外阅读上经常看到的是part of而不是a part of,part应该是可数名词吧,如果不加不定冠词a也应该加个定冠词the吧,那它们有什么区别?ps:刚才稍微查了一下,有人说a part A small part of a part of, the part of, part of, parts of的区别是什么?These elements become 【part of】 the interstellar gas and dust.这些元素成了星际气体和星际尘埃的一部分.请问：这里用part of对不对?为什么? PART OF