请教我自己翻译的一句话 不知道对不对 大家帮忙看看 谢谢啦

你这样翻译可以，非限制定语从句可以这样用。用of是对的，也可以用for, 可以通用，有很多这样的例子。
如果用介词短语翻译也不错:Sino-US trade has developed rapidly with a fundmental reason, which lies in the substancial complementarity.

sino－us trade has developed rapidly，a fundmental reason that leads to substantial complementarity.

非限制性定语从句用的不错，但引导词which前的介词应用for，因为reason常与介词for连用。因此本句应为：Sino－us trade has developed rapidly，the fundmental reasom for which lies in the substancial complementarity.
祝进步。

可以。但是介词用错了，把 reason of 改成 reason for 即可。

中国－美国贸易迅速发展，根本原因在于本质的互补性