约600,000至800,000只沙丘鹤只能使用位于内布拉斯加中部的几公里河流——人们已经用机械清理了这个地区的木本植被，使鸟类无法忍受。
Some 600, 000 to 800, 000 cranes use just a few miles of the river in central nebraska-areas that have been mechanically cleared of the woody vegetation that the birds can't tolerate.
约600,000至800,000只沙丘鹤只能使用位于内布拉斯加中部的几公里河流——人们已经用机械清理了这个地区的木本植被，使鸟类无法忍受。
Some 600,000 to 800,000 cranes use just a few miles of the river in central nebraska-areas that have been mechanically cleared of the woody vegetation that the birds can't tolerate.
而郑鹤春、郑鹤声两兄弟合著的《中国文献学概要》则是当代中国第一次使用“文献学”的名称来概括这门学科的。
Using "philology"in modern china to sum up a subject for the first time was brothers, zheng Hesheng and zheng Hechun, who co-written a work, outline of Chinese philology.
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