根据威特莫尔教授的话，尽力地去确定最早的鸟类还没有得到半点的确认，但新的发现能飞速地改变前景。
According to Prof Witmer, little is certain in trying to determine the earliest bird and new findings can rapidly change perspectives.
这项新研究将史威特南之前有关巨型水杉年轮记录火灾历史的研究再次向前推进了1000年。
The new research extends Swetnam's previous tree-ring fire history for giant sequoias another 1, 000 years into the past.
玛特威是个相貌端正的老人，穿一件新的皮褂子和一双毡靴，这时候抬起温和的浅蓝色眼睛往上看，瞧着坡度平缓的高岸上一个美丽如画的村子。
Matvey, a fine-looking old man in a new sheepskin and high felt boots, looks with mild blue eyes upwards where on the high sloping bank a village nestles picturesquely.
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