In the case of the heartbeat event type, it can represent the time since the trigger start event if it's the first heartbeat for the current GC cycle.

对于 heartbeat 事件类型，它用来表示从 trigger start 事件起所经过的时间（如果它是当前 GC 循环的第一次心跳）。

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Doctors have identified many of the things that may start,or trigger, an asthma attack.

VOA: special.2009.07.28

Making data digital from the start can trigger a whole range of positive events.

CNN: ASIANOW - TIME Asia

Currently, individuals waiting for a green card often may be passed over for promotion or may hesitate to change jobs because such actions could trigger the need to re-start the green card process.

FORBES: Obama Administration Can Improve Immigration Policy in Many Ways

This information in SEC filings would trigger market forces, and companies would start ensuring they had a strong security program.

FORBES: Rockefeller Admits Congress Lacks Foundation for Cybersecurity Legislation