1. at a premium : 在票面价值以上, 非常珍贵;
2. put a premium on : 重视, 奖励, 鼓励;
2. If you buy three you get a premium of one more, free. 你买三个,可以再送你一个。
3.
3. He paid premiums on his life insurance last year. 他去年付了人寿保险费。