There's no simple solution to this problem.
這個問題沒有簡單的解決辦法。
It should have been a simple matter to check.
檢查核對本來應該是件簡單的事情。
I need a simple yes or no to my questions.
我的問題只需要簡單地回答是或不是。
It wasn't quite as simple as I thought it would be.
這事不完全像我想的那么簡單。
The principle behind it is very simple.
其中的原理十分簡單。