社会各界响应号召，共同参与慈善活动。

Shèhuì gèjiè xiǎngyìng hàozhào, gòngtóng cānyù císhàn huódòng.

Various sectors of society respond to the call and participate in charity activities together.

学校号召全体师生参加周末的志愿服务活动。

Xuéxiào hàozhào quántǐ shīshēng cānjiā zhōumò de zhìyuàn fúwù huódòng.

The school calls on all teachers and students to take part in the weekend volunteer service activity.

在市长的号召下，市民纷纷加入到环保行动中来。

Zài shìzhǎng de hàozhào xià, shìmín fēnfēn jiārù dào huánbǎo xíngdòng zhōng lái.

Responding to the mayor's call, citizens have been joining environmental protection actions one after another.