您要查找的是不是：
- at a prearranged signal 看到预订的信号
- The tiger in the cage gnawed listlessly at a bone. 笼子里的老虎在没精打采地啃一根骨头。
- He will sell his house at a sacrifice because he needs money. 因为他缺钱，他将亏本出售他的房子。
- A variety of food is sold at a supermarket. 超级市场各式各样的食物均有出售。
- A live band is always a good draw at a party. 现场演奏的乐队在聚会上总是很吸引人的。
- At a distance of six miles you can't see much. 距离六英里以外的东西很难看清。
- He used to abandon his work for months at a time. 他过去每次放下工作就是几个月。
- We can get six people round this table at a pinch. 必要时这张桌子可以坐六个人。
- I want to sing at a karaoke bar next. 接下来，我想去卡拉OK酒吧唱歌。
- She cocked her hat at a jaunty angle. 她把帽子歪戴着,一副俏皮的样子。
- The old man set off at a quick trot. 老人快步走开了。
- You may open a current account at a bank. 你可以在银行开立一个活期帐户。
- I got this cheap at a department store sale. 我在百货公司特价廉售时买到了这件便宜货。
- I will sell the house at a price within reason. 我将以合理的价格出售这幢房子。
- He tossed the peanuts into his mouth one at a time. 他每次将一粒花生扔进嘴里。
- She was giggling at a letter from a boy. 她正对着一男生写给她的信吃吃地笑着。
- Can you work for six hours at a stretch? 你能不能不休息连续工作6小时吗？
- We stopped at a campsite for a week. 我们在露营地呆了一个星期。
- The machine stops and starts at a touch. 这机器一触即可停止或开动。
- I made his acquaintance at a party. 我是在一次聚会上认识他的。
