There are two main groups of bats, which are believed to have evolved independently of each other, but both from a common ancestor.
蝙蝠主要有两大类,人们认为它们是各自独立进化的,但都来自同一个祖先。
我们都来自英国。
Jill and Scott are both from Pratt, and they are building their "dream house".
吉尔和斯科特都来自普拉特,他们正在建造他们的“梦想之家”。
both from nineteen seventy-four.
VOA: special.2009.11.30
We want to integrate. So let's take the integral of both sides, going from the initial point to the final point.
分别从初态,到末态做积分,消去微分。
Suppose you are being pulled by my favorite animals -- the elephants -- from both sides by equal force.
假设我最喜欢的动物,大象从两边拉你
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