The Four Feathers 四羽毛 ; 四片羽毛 ; 四片白羽
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）。
The oiled birds are washed in warm water and detergent, then dried and allowed to rest for four to seven days until their feathers are waterproof again.
工作人员用和温水和清洁剂为这些鸟清洗，然后擦干，并让它们休息四于七天，等到它们的羽毛恢复防水功能。
The present situation of study on the evil cult expresses four feathers of the following: 1. a widely participation has become a trend;
目前的研究现状呈现出以下四个特点：1。形成了广泛参与的态势；
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