China has the world's most ancient tree species — metasequoia.

中国有世界最古老的树种——水杉。

《新英汉大辞典》

Unless the ancient tree hunt proves otherwise, this is believed to be the largest tree of its kind in the country, its branches spreading out over an area of 1, 500 sq m

这棵巨大的悬铃树树冠遮盖区域达1500平方米，被认为是整个英国同类树种中最大的一棵——除非“古树搜寻”活动能有其他发现。

youdao

Amber is actually ancient tree sap that has hardened over millions of years.

它其实是古代树木的汁液，经过数百万年硬化而成的。

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Slowly she began her dangerous trip down the ancient pine tree.

VOA: special.2010.04.03

There's even documentation for an ancient tree situated below the front porch.

WSJ: Hudson River Schooling

Walking through my favorite part of campus, past an ancient gnarly tree by the faculty club, I came upon three students playing frisbee.

FORBES: A Texas Transplant Returns To Berkeley

From the shadow of the garage, I beheld the back yard, with its Norwegian maples, the tilted white birches, the ancient apple tree whose branches touched the windows of the family room, and for the first time, it seemed, I understood the green glory of this acreage as something indifferent to human life and quite apart from the Victorian manse set upon it.

NEWYORKER: Wakefield