郑宇光和杨树荫60多岁，已经退休，分别是一名儿科医生和化学家。

Yuguang Zheng and Shuyin Yang were retired and in their 60s. A pediatrician and a chemist respectively.

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郑宇光和杨树荫60多岁，已经退休，分别是一名儿科医生和化学家。

Yuguang Zheng and Shuyin Yang were retired and in their 60s. A pediatrician and a chemist respectively.

youdao