我曾經考過國際貿易丙級證照，但是內容學的不夠深入，還有很多需要努力的地

我曾經考過國際貿易丙級證照，但是內容學的不夠深入，還有很多需要努力的地方，特別是在英文和國貿單據的製作，

結果 (英文) 1:

I once took the International Trade Class C Certificate, but I didn’t learn the content in depth enough. There are still a lot of things I need to work on, especially in English and the production of international trade documents.

結果 (英文) 2:

I have taken the International Trade Certificate C before, but my knowledge of the content is not deep enough, and there is still a lot of work to be done, especially in the production of English and international trade documents,

結果 (英文) 3:

I have taken the third-class certificate of international trade, but the content is not deep enough, and there are still many places to work hard, especially in the production of English and international trade documents.