1 [U] a situation in which there is a lot of action or movement 繁忙的活动；热闹: The house was full of activity on the morning of the wedding. 举行婚礼的那个早上，房子里很热闹。 [OPP] inactivity 反义词为 inactivity

2 [C] something that you do, usually regularly and for enjoyment 所做的事（多指经常的和为消遣的）: The hotel offers a range of leisure activities. 这家饭店提供许多休闲活动。 ☞Look at the note at act ². 参看act^2的注释。