Our school held a mass cleanup after the typhoon.
颱風過後,我們學校舉辦了大量的清掃活動。
The city started mass testing to keep people safe.
為了保障安全,城市開始大量檢測。
The company began mass production of cheap masks.
那家公司開始大量生產便宜的口罩。
The teacher sent a mass email to all parents.
老師寄了一封群發信給所有家長。