An arched fossilized foot bone found in Ethiopia shows that human ancestors walked upright 3.2 million years ago and were no longer tree dwellers, said a study Thursday in the journal Science.
周四出版的科学杂志上的一个研究声称：从一段在埃塞俄比亚发现的足弓部化石骨骼上研究显示，人类祖先在320万年以前已不再生活在树上而是开始在地上直立行走。
The bone also shows that A. afarensis had abandoned the flexible midfoot that apes use to grasp tree branches, in favor of an arch that makes upright walking more efficient.
这个骨头也说明南方古猿已经抛弃了猿所具有的用于攀爬树枝的柔韧的足中段结构，由于足弓结构的出现，直立行走变得更有效率。
Behind the first tree I found a man standing upright.
在第一株树的后面，我看见一个人立着。
Then the old man asked the young man to tie it again, and immediately the young tree stod upright as it used to.
随后，老人让年轻父亲又绑好绳子，小树马上像先前那样站得笔直。
When threatened, they can drop from a tree into the water and sprint, upright, about 5 feet (1.5 meters) per second across the surface.
当遇到危险，它们就从树上跳到水里，然后直立身体，以每秒5英尺(1.5米)的速度在水面上奔跑。
They are upright as the palm tree, but speak not: they must needs be borne, because they cannot go.
它好像棕树，是旋成的，不能说话，不能行走，必须有人抬着。
Then the old asked the young to tie it again, and immediately the young tree stood upright as it used to.
接着，老人又叫年轻人系好绳子，小树马上笔直如初。
The cultivar has ramose crown and upright tree appearance.
树冠分枝形，树姿直立。
A tall upright tree appreciates its body and it is proud of it.
一棵树为它高大挺拔的身躯而自豪。
Perhaps the crooked tree is no beautiful than the straight and upright tree, but the latter is interested and felled by carpenter.
歪斜的树也许不如挺直的树好看，但是挺直的树被木匠相中而砍伐。
Then the old man asked the young man to tie it again, and immediately the young tree stood upright as it used to.
随后，老人让年轻的父亲又绑好了绳子，小树马上又像先前那样站的笔直了。
Then the old man asked the young father to tie it again, and immediately the young tree stood upright as it used to.
接着，老人又叫年轻的父亲系好绳子，小树马上笔直如初。
Then the old man asked the young father to tie it again, and immediately the young tree stood upright as it used to.
接着，老人又叫年轻的父亲系好绳子，小树马上笔直如初。
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