shì / zhǎng / tōng / guò / yí / duàn / shì / pín / xiàng / nián / qīng / rén / gé / kōng / hǎn / huà / gǔ / lì / tā / men / cān / jiā / zhì / yuàn / huó / dòng

市长通过一段视频向年轻人隔空喊话，鼓励他们参加志愿活动。

The mayor addressed young people from afar in a video, encouraging them to volunteer.