He was precautious in crossing the rickety bridge.走过这座摇摇晃晃的桥时他小心翼翼....

adj.有防备的，戒备的，警惕的...

precautious的音标：precautious的英式发音音标为：[prɪ'kɔ:ʃəs]precautious的美式发音音标为：[prɪ'kɔʃəs]...