只有当第二个断点被检取后，第一个才会成为活动的。
Only after the second breakpoint is picked up will the first become active.
一只蚂蚁在第一天可能是蚁巢保全工，第二天也许就成了食物拾取工。
An ant might be a nest worker one day, a trash collector the next.
其中一个是，捕取二氧化碳并将其储藏到海床。
取二个数据，第二个数据正好是第一个数据一分钟后。
Take two readings, the second one exactly one minute after the first one.
取二个数据，第二个数据正好是第一个数据一分钟后。
Take two readings, the second one exactly one minute after the first one.
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