同住者

例句：

1. 1. We have a roommate who is very helpful when we need someone to help with our homework.
   我们有一个室友，当我们需要有人帮忙做作业时，他非常有帮助。
2. 2. The roommate has been sharing the expenses for the past two months.
   室友已经分担了过去两个月的开销。
3. 3. They decided to share the cost of their apartment by splitting the rent equally.
   他们决定通过平分租金来分担公寓的费用。