Conclusion: Dipsacus is a natural class group, and the slight difference of its poll...
结论：续断属为一自然分类群，花粉粒的细微差异对种的划分有一定意义。
At first he was a little shy in class, but now he ACTS more natural.
刚开始他在班级里有些害羞，现在他已经演的很自然了。
Our class is going to visit the Museum of Natural History.
我们班要去参观自然历史博物馆了。
National Natural Science Award (second class)
国家自然科学奖二等奖。
National Natural Science Award (second class)
国家自然科学奖二等奖。
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