共通

例句：

1. 1. They live in a common house with other students.
   他们和其他学生住在一个共同的房子里。
2. 2. The common cold is the most common illness in children.
   普通感冒是儿童最常见的疾病。
3. 3. Common sense tells us that water boils at 100 degrees Celsius.
   常识告诉我们，水在100摄氏度时会沸腾。