The sensor system is one of several that protect the shuttle's main engines by triggering their shutdown 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。
2
At the onset of the earthquake, the plant automatically shutdown the fission process, which normally would leave the coolant system — both the main one and a backup generator — still operational.