xué / shēng / men / lián / míng / xiě / le / yì / fēng / chàng / yì / shū / hū / yù / dà / jiā / jié / yuē / yòng / shuǐ

学生们联名写了一封倡议书，呼吁大家节约用水。

The students jointly wrote a proposal calling on everyone to conserve water.