1. "I didn't think I could ever get used to living in a big city after living in the country." 这句话的改写为：“我在农村住了之后，本以为自己永远无法适应大城市的生活。”
2. "Cannabis has been used for medicinal purposes since antiquity." 这句话的改写为：“自远古以来，大麻一直被用作药用。”
3. "Many words once commonly used have fallen into desuetude." 这句话的改写为：“许多过去曾广泛使用的词汇，今天已经不再使用。”
4. "These expressions are often used interchangeably, but they do have different meanings." 这句话的改写为：“这些表达方式经常被交替使用，但它们确实有不同的含义。”
5. "Her article is a discussion of the methods used in research." 这句话的改写为：“她的文章讨论了研究中使用的方法。”
6. "Acupressure is used to release tension spots in the shoulders and neck." 这句话的改写为：“指压按摩用于缓解肩部和颈部的紧张部位。”
