胡杨集合种群在种子时间上存在异质性。
There was heterogeneity in seed time in the euphratica meta-population.
在那浩瀚的沙漠中，生长着一种稀有的树种，叫胡杨。
There, in the boundless desert, grows a rare variety of tree called euphrates poplar.
胡杨（网名）是一位家长志愿者，为争取随迁子女高考奔走了三年。
Hu Yang, who goes by her Internet name, has been a volunteer for the advocacy group for three years.
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