call option event
看涨期权事件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the event a crime was committed, surveillance cameras would have collected footage. But the best option would have been to call a friend or the school's security department.
虽然，一旦有犯罪行为发生，监控摄像头会留下录像，但是及时给朋友或者学校保卫处打电话仍是上上策。
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