yán / jiū / rén / yuán / zhèng / zài / guān / chá / zhè / zhǒng / dòng / wù / shēng / zhí / xiàn / de / fā / yù / qíng / kuàng

研究人员正在观察这种动物生殖腺的发育情况。

Researchers are observing the development of this animal's gonads.