fitness
/ˈfɪtnɪs/noun
mass noun
1- the condition of being physically fit and healthy健康：
disease and lack of fitness are closely related
疾病和体弱紧密相关
as modifier a fitness test.健康检查。
1.1
fitness for/to do
the quality of being suitable to fulfil a particular role or task合格; 胜任; 适合：he had a year in which to establish his fitness for the office.
他有一年时间来使自己的任职资格得到承认。
1.2
- Biology an organism's ability to survive and reproduce in a particular environment【生】（生物体的）环境适度：
if sharp teeth increase fitness, then genes causing teeth to be sharp will increase in frequency.
如果尖齿的环境适度增强, 那么导致牙齿变尖的基因出现的频率就会增加。