A real and pressing issue is that many plant species have not yet been cataloged, and so their place in the ecosystem is unknown.

一个现实而紧迫的问题是，许多植物物种还没有被编目，因此它们在生态系统中的位置是未知的。

youdao

So far, machines have a pretty hard time emulating creativity, arbitrary enough not to be predicted by a computer, and yet more than simple randomness.

到目前为止，机器在模仿创造力方面有相当困难的时间，它们的随机性足以让计算机无法预测，但也不仅仅是简单的随机性。

youdao

The delicate balance is almost impossible: Keep just enough in stock to service customers promptly and fulfill orders, yet not so much that product is left languishing on the shelf.

精确的平衡是几乎不存在的：只要让你的库存能够满足客户的需求足够备货就好了，但是也不要让多余的产品在储货架上久放着。

youdao

That seems to me to be a fairly out-there proposition. And yet, the evidence is so overwhelming, that really nobody has surfaced to suggest that indeed this does not happen. John Geiger says there is a wide acceptance of the Third Man experience among the scientific community and the general public.

VOA: special.2010.02.24

Remember when God said, "The sin of the Amorites is not yet complete, when they have sinned so much and to such a degree, they will be vomited out and then your tenancy can begin"?

记住上帝说的，“亚摩利人的罪孽还没有完，它们的罪孽是如此深重，他们最终将被驱逐，另一批人又重蹈覆辙，“

耶鲁公开课 - 旧约导论课程节选

because she's not in school yet, and so we spend a lot of time

因为她还没有上学，所以我们花很多时间

在空闲时间 - SpeakingMax英语口语达人

The need for the parts of an engine to fit together tightly enough to stop hot gases seeping where they should not, and yet not so tightly that they rub on each other in a way that wears them out, is a constant bane of engine designers.

ECONOMIST: An engine made of water

Barnes and Noble has struck a successful balance between having enough books to make the customer feel he has sufficient choice, and yet not so many as to make him feel overwhelmed.

ECONOMIST: Waterstone��s

We do not fully understand Al Qaeda and its relationship to supportive communities in the Islamic world, and so are not yet able to develop an effective strategy for countering its propaganda in those communities, let alone for winning the information campaign in the war against terrorism.

CENTERFORSECURITYPOLICY: Waging the ��War of Ideas��