"Every April, when these trees become mature, they will spread the blowball," she said.
韩研究员说，每年4月毛白杨果实成熟时便会开裂
杨
。
球"Every April, when these trees become mature, they will spread the blowball," she said.
韩研究员说，每年4月毛白杨果实成熟时便会开裂杨。
声
：
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