Xu calls it a "four-winged" dinosaur because it had long, pennaceous feathers on its arms and legs.
因为其前后肢上都存在着较长的羽翮，因此徐星将它称之为“四翼”恐龙。
Since his election four years ago, he has repeatedly ruffled feathers.
自四年前推选上任之后，他就没完没了地惹是生非。
In the newest PNAS study, scientists examined a remarkable fossil specimen that had feathers on all four limbs, somewhat resembling a bi-plane.
在这项最新的发表在PNAS上的研究中，科学家仔细考察了一块奇特的化石标本“小盗龙”（mircoraptor），这块化石上的四肢全部都有羽毛，有点类似两栖飞机（bi-plane）。
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