这些讨论都贯穿着一条共同的主线。
对分子水平只有一种解释，那就是共同的祖先。
There is only one explanation for that at the molecular level, which is a common ancestor.
所有的通信系统，包括语言，都有一些共同的特征。
So all communication systems, language included, have certain features in common.
在我看来，优秀的朋友有一些共同的特点。他们体贴、幽默。
In my opinion, good friends have certain characteristics in common. They are considerate and humorous.
分享面包或其他食物是人类共同的传统，可以促进团结和信任。
Sharing bread or other foods is a common human tradition that can promote unity and trust.
他们互相看了一眼，由于一种共同的、不知不觉的冲动往后退了一步。
They glanced at each other, and retreated a step by a common and unconscious impulse.
可以集水的平原和洼地是它们共同的特征，但它们只占景观的一小部分。
Flats and depressions where water can collect are common features, but they make up only a small part of the landscape.
尽管每个人听音乐的方式都不一样，但所有的音乐经历都是由共同的基础发展而来的。
Although everyone hears music differently, there is a common ground from which all musical experiences grow.
坐荷尔蒙过山车意味着许多变化——我们都有共同的担忧——无论是对于男孩还是女孩。
Taking a ride on the hormonal roller-coaster means lots of changes—and a lot of common worries—for both guys and girls.
在今天这个被语言和边界分割的地区，考古学家有责任让公众了解他们共同的文化遗产。
In a region today divided by languages and borders, archaeologists had a duty to inform the general public about their common cultural heritage.
它表明所有的生物都是相关的，从甲虫到莲花，所有的生物都是由一个共同的祖先进化而来。
It suggested that all living things were related, from the beetle to the lotus, and that everything descended ultimately from a single common ancestor.
用微笑和幽默来打破紧张气氛，强调这是段友好的谈话，并且所有人都在朝着共同的目标努力。
Break the tension with smiles and humor to reinforce the idea that this is friendly discourse and that all are working toward a common goal.
团队成员只有在为一个共同的目标而团结一致、沟通顺畅的情况下，才会更有动力去履行自己的职责。
Team members will only become highly motivated to fulfill their own duties when they stand united in the pursuit of a common goal and communicate smoothly.
尽管每个艺术家都有自己独特的风格，但所有艺术家都有一个共同的目标：让人们关注我们城市的污染问题。
Each artist has their own individual style but all artists share a common aim: to draw attention to the pollution in our cities.
社会若要成为一个统一的群体，它的成员就必须有共同的价值观。
If society is to exist as a unity, its members must have shared values.
其中一个共同的方式是使用习语。
有哪些共同的目标？
这两家公司决定合作，因为他们有共同的利益。
The two companies decided to work together because they had common interest.
一般来说，优秀的学习者都有一些共同的好习惯。
Generally speaking, excellent learners have some good habits in common.
更大的野心以及成为强手中的强手的强烈渴望，也是一个共同的特征。
Greater ambition as well as a burning desire to be the best of the best is also a common characteristic.
他们在同一个足球队踢球，玩同样的玩具，睡一间房，有共同的朋友。
They played on the same football team, and shared all the same toys, the same bedroom and the same friends.
他们的特点是面对面的联盟以及与那些因共同的关心而联合起来的人的合作。
They are characterized by the face-to-face association and cooperation of persons united by ties of mutual concern.
在鳍足类动物中发现的共同的细节设计，这可能说明了它们有一个共同的祖先。
The common detailed design found among the pinnipeds probably indicates a common ancestor.
然而，共同的祖先对于新物种又太现代，而不能作为来自非洲的人类首次远足的遗迹。
The common ancestor is, however, too recent for the new species to be a remnant of the first human excursion from Africa.
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