代替词是jollification，中文意思是活动，热闹

排练场被午餐时段活动搞得很热闹。The rehearsal studio is buzzing with lunchtime activity.

经济活动常常遵循周期性模式。Economic activity often follows a cyclical pattern.

这个测试显示出大脑的电流活动。The test records the electrical activity of the brain.