您要查找的是不是：
- boom lowering equipment 臂架放倒机构
- Stand clear of the swinging boom of the crane. 不要走近转动的超重机吊杆。
- The lowering clouds threaten rain. 这阴霾的云层预示即将下雨。
- a cranelike device (usually one of a pair) for suspending or lowering equipment (as a lifeboat). 用来悬挂或降低器材的起重装置。
- He made his pile during the property boom. 在房地产生意兴隆期间他发了大财。
- The clock began to boom out twelve. 时钟开始敲十二点。
- Sherman recommended that Clarke be disciplined, but higher-ups rejected the idea. 谢尔曼建议对克拉克进行纪律惩戒，但高层拒绝了这个意见。
- 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。
- She looked up at the lowering sky. 她抬头看著阴沈的天。
- 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。
- Argued the clerk into lowering the price. 极力说服售货员降低价格
- Unwaged members pay a lower entrance fee. 无固定收入的人入场费从优。
- The economic boom tapered off in the 1970s. 经济繁荣在七十年代慢慢消失了。
- The city is having a building boom. 这个城市正在大兴土木。
- The oil market is enjoying a boom. 石油市场欣欣向荣。
- A man's voice is usually lower than a woman's. 男子的嗓音通常比女子的低。
- The little boy used to push out his lower lip. 那个小孩以前老要撅起下嘴唇。
- Tom was lying on the lower bunk. 汤姆躺在下铺。
