21616—first and third years live on the main site. rooms of the second and third year are allocated by ballot, and stude

21616—first and third years live on the main site. rooms of the second and third year are allocated by ballot, and students worried about their finances can request a smaller, cheaper room. 3817什么意思
想问：
1—first and third years live on the main site：怎么翻译?
2—students worried about their finances can request a smaller, cheaper room： 怎么翻译?
3—上句中的request：怎么翻译?
1—first and third years live on the main site：
live on ：居住...main：adj 主要的; 最重要的
site：n 1. 位置, 场所, 地点2. 地皮，地基，选址3. 遗址，遗迹
main site：这里表示—主要的校区
翻译：第一年和第三年住在主校区。
2—rooms of the second and third year are allocated by ballot：
allocate：vt 1. 分配, 分派2. 把…拨给，划…归
ballot：n 1. 投票表决, 选举2. 选票3. 投票总数 vt. & vi. (使)投票表决
翻译：第二年和第三年的房间通过投票来分配。
3—and students worried about their finances can request a smaller, cheaper room
注意：这里的谓语是can不是 worried about
worried about 做students 的后置定语
students worried about their finances ：担心他们经济的学生。
翻译时不是：学生们担心他们的经济更够要求一个更小，更便宜的房间。
正确的翻译：担心他们经济的学生可以要求一个更小，更便宜的房间。