The sensor system is one of several that protect the shuttle's main engines by triggering their shut down if fuel runs unexpectedly low.

该传感器系统是数个保护航天飞机主引擎的系统之一，如果燃料过低，则该系统将触发关机。

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At the onset of the earthquake, the plant automatically shut down the fission process, which normally would leave the coolant system — both the main one and a backup generator — still operational.

地震发生时，核电站已经自动中止裂变反应过程，一般只剩下冷却系统——主发电机和备用发电机——仍处于运行状态。

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