propeller guard meaning in English

舰船螺旋桨的护罩
舰尾护架
螺旋桨防护栅
推进器护栏

A participant asked whether it is possible to request the p4 boat working at hoi ha wan pier installed a propeller guard to prevent accident on swimmers and snorkellers
船只安装螺旋桨护罩，以免对泳客及徒手潜水人士造成意外。
A participants asked if propeller guard could be installed on p4 vessel for the purpose of minimizing the possible injuries caused by these vessels to the swimmers around the pier
船只可否安装螺旋桨护罩，假如码头附近有泳客被这些船只所伤，伤势便可