[mass noun]the condition of being physically fit and healthy 健康;健壮 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,体质测试。 ■(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. 他花了一年时间让自己能够胜任这个职位。 ■(Biology)an organism's ability to survive and reproduce in a particular environment (生)(有机体的)适合度 if sharp teeth increase fitness, then genes causing teeth to be sharp will increase in frequency. 如果尖齿的适应力增强,那么导致牙齿变尖的基因出现的频率就会增加。