This workout helps you to burn off fat and tone muscles.
这项锻炼有助于消耗脂肪，使肌肉强健。
《牛津词典》
2
Because it's such a pity if you start off on a bright tone on a story and suddenly realize you are talking about some people having been killed in a road crash.
因为如果你一开始用欢快的语调讲一个故事，然后突然意识到你讲的是一些在车祸中丧生的人，这是很遗憾的。
3
It's such a pity if you start off on a bright tone on a story and suddenly realize you are talking about some people having been killed in a road crash.