It might seem that certain traits would clearly define a species as a keystone species.
似乎某些特征会清楚地将一个物种定义为关键物种。
The differences between the groups and the similarities within each group made it seem certain to most biologists that the tree of life had only two stems.
类群之间的差异和每个类群内部的相似性使大多数生物学家确信，生命之树只有两个树干。
After thinking about it for a while and observing certain other signs, I have a theory that explains why the super-angels may be smarter than they seem.
在对此思考了一会儿并观察到某些其他的迹象，我有了一个理论来解释为什么超级天使们可能比他们看起来更聪明。
A certain amount of the "keep quiet" approach to business can be useful for the community, but it is dangerous if it becomes so common that the love of freedom comes to seem like an eccentricity.
一定数量对商业行为“保持沉默”的办法对自由软件社区是有用的，但如果他们变得过份普遍以至于对自由的热爱似乎成了怪癖，这便是危险的了。
Although certain coastal areas are heavily defended, these defences do not seem to be in any great depth, and it would appear that the Germans have concentrated their defence on the beaches.
虽然某些沿海地区有重兵把守，但这些防御工事似乎没有任何深度，这样看来，德军把海滩当作了自己防御的重点。
The IT departments of a certain size seem to forget the fact that the only reason they exist is to sell more or make more of whatever the business does.
特定规模的IT部门似乎忘记了这样一个事实，即它们存在的惟一理由就是要出售或制造更多企业产品。
However, others say that while perfectionism might seem to be advantageous in certain situations, it always has a dark side that inevitably rears its head.
然而，其他人说尽管完美主义或许在某些情况下是有益的，但它的阴暗面却不可避免的会出现。
It's even harder to imagine how seesawing blood sugar levels could possibly lead to cancer, but high insulin levels seem to promote an environment that makes it easier for certain tumors to grow.
这更难想象血糖水平怎么能导致癌症，但是高水平的胰岛素似乎能营造一种环境促进特定肿瘤的生长。
And even if it is interested it looks at the flower with certain appreciations and verbal descriptions which seem to give he observer a feeling that he has really looked at it.
即使心智感兴趣，它还是会带着某种欣赏之情和语言描述去观察这朵花，这似乎给了观察者一种他确实在观察的感觉。
And even if it is interested it looks at the flower with certain appreciations and verbal descriptions which seem to give he observer a feeling that he has really looked at it.
即使心智感兴趣，它还是会带着某种欣赏之情和语言描述去观察这朵花，这似乎给了观察者一种他确实在观察的感觉。
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