英语翻译Uniforms are economical as well,because they can be used in turn by younger siblings.

问题描述:

英语翻译
Uniforms are economical as well,because they can be used in turn by younger siblings.

in turn是一个短语,意思是依次,轮流
be used by放在一起是被谁谁使用的意思。

校服也可以节约利用,它们可以留给学弟学妹循环使用。

不清楚上下文,大致翻译如下:
制服也比较经济,因为它们可由较年轻的兄弟姐妹依次使用.
in turn:依次,轮流
by在这里起被动态中引出主语的作用.
后一句即because younger siblings can use them in turn.