a litre of milk的用法和样例：
- To the industry's delight, the prime minister, Wen Jiabao, visited a dairy farm last year and said his dream was that all Chinese drink half a litre of milk a day, especially schoolchildren.
- A litre of gas has less mass than a litre of water.
- Could you get a litre of water to survive me?
- Inside is a litre of thin, urinous liquid.
- A litre of blood was found in his abdominal cavity.