This is a complex issue and we need to take it seriously.
这是一个复杂的问题,我们需要认真对待。
It's a complex issue, and I should leave it having said this much, at least for the moment.
这是一个复杂的问题,我应该先说这么多,至少暂时这样。
Migration is a complex issue, and biologists define it differently, depending in part on what sorts of animals they study.
迁徙是一个复杂的问题,生物学家对此有不同的定义,定义的方法部分取决于他们研究的动物种类。
That sounds simple. But the issue is a complex mix of technical,business, political and legal questions.
VOA: special.2009.09.25
So it's a complex issue, and I should leave it having said this much, at least for the moment.
因此它是一个很复杂的问题,而我就讲到这里,至少暂时这样。
We can already use that in terms of single ions to think about a really complex biological issue, which is to talk about ion channels.
我们已经能够仅仅凭借这个关于单个离子的原理,来讨论一个非常复杂的生物问题了,我们要讨论的就是离子通道。
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