单词“exercise”是英语里使用频率非常高的一个单词。只要说到关于“身体健康”或者“做作业”的话题，大家几乎都会用“exercise”。它既可以是名词，也可以做动词，因此它的含义也特别多。怎样掌握这个关键词的运用，本集《你问我答》将通过大量例句为 ...

Aerobic exercise is cardiovascular conditioning that strengthens both your heart and lungs. The word “aerobic” means “with oxygen,” as this kind of exercise is fueled by the oxygen that you get from ...