Complex is the opposite of ‘simple’.
Complex is used to refer to the level of components in a system. If something is complex, it means that it has many components, and its structure is not simple. It may be made up in a sophisticated way. But Complex doesn’t mean Difficulty.
Complex是複雜的意思，它是simple簡易的反義詞。如果一個事物是complex的，意思是說這個東西結構複雜，各個部件之間關係複雜、構造複雜。但是，complex複雜不意味著有難以克服的困難。
Complicated is the opposite of ‘easy’.
Complicated implies something that hard to understand, because of too much information.
Complicated refers to a high level of difficulty. If a problem is complicated, there might be or might not be many parts, but it will certainly take a lot of hard work to solve. If something is complicated, then it is difficult to use.
Complicated是難以理解的意思，它是輕鬆簡單的反義詞。通常意味著一個事物特別難以理解，是比complex更高層次的困難。Complicated的東西不一定構造很複雜，只是意味著很難理解，很難找到解決問題的思路。如果一個工具、儀器、設備被人們認為complicated, 那這些東西肯定是難以操作使用的。
“A self-driving car will be very complex, because it has many systems on it. But it is not complicated to ride it for people."
英語單詞Complex, Complicated的區別
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