什麽時候用twice 什麽時候用two times?

Twice = two times.
當可以使用twice就需優先使用，使句子更加正確優美，例如
It has happened two times before. – 正確.
It has happened twice before. – 正確且優美.
24 is two times as large as 12. – 正確.
24 is twice as large as 12. 正確且優美.
某些情況取代造成句意怪異時，則不能取代.
It only happened the last two times. – 正確.
It only happened the last twice. – 錯誤之怪異句型.
資料來源 – 如下英文公開網站之翻譯
http://english.stackexchange.com/questions/171833/twice-vs-two-time

句型一:A+be+two/three times+形容詞比較級+than+B
Ex:This burger is two times bigger than that (one).
句型二:A+be+twice/half three times+as+形容詞+as+B
Ex:This burger is twice as big as that (one).

基本上兩個詞的意思是一樣的，使用時機也一樣喔。