例句：

　　The burglar alarm should be professionally installed.

　　防盜警報應當由專(zhuān)業(yè)人員安裝。

　　He opened the door and came face-to-face with a burglar.

　　他打開(kāi)門(mén)和竊賊打了個(gè)照面。

　　The main thing to remember is to switch off the burglar alarm.

　　最要緊的是記住關(guān)掉防盜報警器的開(kāi)關(guān)。