[相关词组]：
take part in activity
do exercise
join in morning exercise
爱心活动 love outreach
不法活动 an illegal practice
不活动 inactive; inoperative; silent
舱外活动 [Aeronautics] extravehicular activity (EVA)
达标活动 target hitting activities
放松活动 [Sports] a relaxation exercise; a limbering-up exercise
非活动性 [Medicine] quiescence
高级神经活动 [Physiology] higher nervous activity
工业谍报活动 industrial espionage
活动靶 a maneuvering target
