To complete a level, keep adding bubbles until the time elapses.
完成一个级别，保持增加的泡泡直到时间耗尽。
Work at the construction site security staff, the level of its business to complete a construction project can be an important element of security.
工作在施工现场的安全员，其业务水平成为施工项目能否安全完成的重要环节之一。
Work at the construction site security staff, the level of its business to complete a construction project can be an important element of security.
工作在施工现场的安全员，其业务水平成为施工项目能否安全完成的重要环节之一。
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