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 ...

America has an obesity problem. The National Institutes of Health estimates that two in five adults are overweight and one out of every three adults are obese. Though a healthy diet has the biggest ...

“An isometric exercise is a static exercise where you hold a muscular contraction without movement, as opposed to a dynamic exercise where the muscles are able to contract from their longest to their ...