在会议上，他郑重呼吁各国加强合作，应对气候变化。

Zài huìyì shàng, tā zhèngzhòng hūyù gèguó jiāqiáng hézuò, yìngduì qìhòu biànhuà.

At the meeting, he solemnly called on all countries to strengthen cooperation and respond to climate change.

医生多次呼吁大家早点打疫苗。

Yīshēng duō cì hūyù dàjiā zǎodiǎn dǎ yìmiáo.

Doctors have repeatedly called on everyone to get vaccinated early.

环保组织呼吁人们少用一次性塑料袋。

Huánbǎo zǔzhī hūyù rénmen shǎo yòng yícìxìng sùliàodài.

Environmental organizations are calling on people to use fewer disposable plastic bags.