float operated explosion-proof mercury switch

例句：

1. 1.The safety of the mine is ensured by the float operated explosion-proof mercury switch.
   矿井的安全由浮筒式防爆汞开关来确保。
2. 2. The new design of the switch has made it more efficient and safer.
   这种开关的新设计使其更高效、更安全。
3. 3.The engineers carefully checked the float operated explosion-proof mercury switch before installing it.
   工程师们仔细检查了浮筒式防爆汞开关，在安装前进行了仔细的检查。