The answer is really quite simple.

　　實際上答案相當簡單。

　　This machine is very simple to use.

　　這臺機器操作非常簡單。

　　The storyline is deceptively simple.

　　故事情節看似簡單。

　　It was a simple but pleasing design.

　　這是一項簡單但令人滿意的設計。

　　Sylvie was a simple-minded romantic.

　　西爾維是個天真浪漫的人。