These days kids grow up so quickly.
如今孩子们成长得真快。
2.in turn 反过来
All theories originate from practice and in turn serve practice.
任何理论都来源于实践,反过来为实践服务。
3.have a hunger for 渴望...
Most children have a hunger for books.
绝大多数孩子都渴望有书看。