关键种 是指珍稀、特有、庞大的，对其他物种具有不成比例影响的物种。它们在维护生态系统的多样性和稳定性上起着重要作用。如果它们消失或削弱，整个生态系统可能要发生根本性变化。关键种有两个显著特点，它的存在对于维持生态系统群落的组成和多样性具有决定性作用，它与群落中的其他物种相比是非常重要的，但又是相对的。关键种（keystone species）是它们的消失或削弱能引起整个群落和生态系统发生根本性的变化的物种。关键种的个体数量可能稀少，但也可能多，其功能或是专一的也可能是多样的。关键种是生态学研究，特别是生物保护学研究中的一个研究热点。关键种可以是为了最大程度地保护生物多样性而进行优先保护的目标。
关键种
网络释义专业释义
双语例句原声例句
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关键是人们变得不再习惯以一种负责任和独立的方式去思考和行动。其中就存在另一个大问题。
The point is that people grew unaccustomed to thinking and acting in a responsible and independent way. Herein lies another big problem.
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这场辩论未能得到解决，因为没有人能够以一种有效讨论这些关键问题的方式提出这些问题。
The debate could not be resolved because no one was able to ask the crucial questions in a form in which they could be pursued productively.
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去年零售商在感恩节和圣诞节之间获得了全年24%的收入，而在现在这个关键时刻采取了一种谨慎的做法。
For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time.
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I think your word "vocation" is the key, certain kind of calling, And I signed the divine wisdom actually.
我认为你所说的“职业“是关键，这是一种召唤，我做的是宣扬神的智慧。
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We've distinguished three different views as to the secret or key to personal identity across time.
我们陆续已经辨别了三种不同的,关于个人认同感关键的理论观点。
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or at least one mechanism, I shouldn't say -- the only one-- one mechanism for doing that is going to be to add functions is that it's going to provide both of these things, so the first thing it's going to do is, it's going to let us break up into modules.
我们处理这些的机制--至少一种机制,我不会说只有一种,一种机制是在我们的语言中增加函数,函数的关键是它要提供分解和抽象,所以第一件要做的事，就是将代码分解为模块。
应用推荐
$firstVoiceSent
- 来自原声例句