For hours on this Sunday morning, Mr.Chen watched and waited for that unknowable moment when one of the thousands of people who cross the bridge every day might try to jump off.

• 在这个星期天早上，几小时下来，陈思就这样注视并等待那个无可预知的时刻，在这个每天都有数千人走过的桥上可能有人纵身跳下。