您要查找的是不是：
- The dog kept a vigilant guard over the house. 这只狗警惕地守护着这所房屋。
- Stand clear of the swinging boom of the crane. 不要走近转动的超重机吊杆。
- He urged them to guard against conceit. 他要求他们防止骄傲自满。
- He made his pile during the property boom. 在房地产生意兴隆期间他发了大财。
- He bribed his way past the guard and escaped. 他买通看守而逃之夭夭了。
- The clock began to boom out twelve. 时钟开始敲十二点。
- I was off my guard and made no suitable reply. 我没提防，因此没有作出适当的回答。
- The guard of honor headed up the whole parade. 仪仗队走在游行队伍的最前头。
- Please guard against pickpockets on the bus. 在公共汽车上要谨防扒手。
- The soldier volunteered for guard duty. 那个战士自告奋勇去站岗。
- The long boom of the crane functions like our arms. 起重机的长臂与我们的手臂功能相同。
- Profit multiply in the boom year. 兴旺之年利润增长。
- The boom of the airplane was damaged. 飞机的尾桁受到损害。
- We heard a hollow boom of thunder. 我们听到低沈的隆隆雷声。
- The guard had orders to shoot on sight. 哨兵奉命见人就开枪。
- The economic boom tapered off in the 1970s. 经济繁荣在七十年代慢慢消失了。
- Be on your guard, I conjure you. 千万要警惕呀，我恳求你。
- The city is having a building boom. 这个城市正在大兴土木。
- Four soldiers stood guard over the coffin. 四个士兵守卫灵柩。
- The oil market is enjoying a boom. 石油市场欣欣向荣。
