1、大多数物质遇冷收缩，所以他们的密度在固态时高于液态。
Most substances contract ething meaningful to take time to learn a nee and take care of their children rather than return to pounds that, school and home every day, part-time e the above discussion, we can conclude that the advantages of bicycle far outweigh the disadvantages, and it will still play an important role in modern society.
