帮忙翻译几个简单的句子, 中译英

1\Some students think old books are not so clean, while others want to keep(保留下来的意思) theirs（名词性物主代词，省略 old books ）.
2\In order to preserve（固定搭配，在这短语中优于save这个动词） the resources, we should...

1,Some students think the old book is originally not that clean, have some a person to want to leave their books.
2, But for the sake of the economy resources, we still should....

Some students think that old books are not healthy, and there're also someone who want to keep theirs.

We should do... in account of saving resource

1. Some students think that old books are not clean,and some other people want to keep their books.
2. However, for saving resource, we should still...

1.Some students think old books are not clean while some others want to keep their books.
2.But in order to saving resoueces,we still should...