1.at rest 休息之中，處于停止狀態，處于安寧狀態
例句：He lies at rest in the Martyrs' Cemetery.
他在烈士陵園安息著。
2.at risk 處境危險，遭受危險
例句：He saved three children alive at risk of his life.
他拼命救出了三個孩子。
3.at sea level 在海平面上
例句：A unit of pressure equal to the air pressure at sea level, approximately equal to1.01325?05newtons per square meter.
大氣壓力壓力單位，等于海平面上的空氣壓力，每平方米約為1。01325?05牛頓
4.at sixes and sevens 亂七八糟；不和
例句：I'm all at sixes and sevens about what to do.
我心里七上八下,不知該怎么辦。
5.at the expense of 由...付費，由...負擔費用；以...為代價，在...受損害的情況下
例句：It is wrong to aim at sheer quantity at the expense of quality.
片面地追求數量而忽視質量是錯誤的。
6.at the mercy of (at sb.’s mercy) 任憑...的擺布，完全受...的支配
例句：A sailor is at the mercy of the weather.
水手受到天氣的擺布。