我们只透露那些在特定时期我们可以稳妥地承担风险的信息。
We reveal only as much information as we can safely risk at a given time.
因此,化石是识别地球历史上特定时期的标志。
Fossils are thus identifying markers for particular periods in Earth's history.
我们说的“公共”指的是它们反映了特定时期特定群体的特点和关注点。
By communal, we mean they reflect the traits and the concerns of a particular community at a particular time.
So that can be unsettling when we think of this as happening at a certain contemporaneous moment in the history of thought.
如果把这个问题放在思想史的特定时期来想,它可能是难以解决的。
Any device can be the dominant at a given moment in the development of literary history.
任何一种方法都可以,在文学发展史的特定时期占支配地位。
Well, that's thanks to your ancestors and thanks to the conditions that they've inherited, that you would seek out a diet that has those particular conditions.
其实,这要归因于我们的先祖,是由于祖先们传承下来的,在特定时期的饮食结构决定的
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