be hard to say

It may be hard to imagine a planet blacker than coal, but that's what astronomers say they've discovered in our home galaxy with NASA's Kepler space telescope.(很难想象一个行星比煤炭还要黑，但是宇航员们的确声称，他们通过NASA的开普勒太空望远镜在我们所处的银河系发现了这样一颗行星。)

There may be two competing deceptions at work here, equally hard to trace: a black lie (“I say I am going to vote Obama, but secretly I will not.(所以可能有两个自相矛盾的谎言在这里作用，两个都很难去追根究底：一个黑色（恶意）的谎言（“我说我会给奥巴马投票，但是我私底下并不会。”）)

We come to know things that we'd be hard pressed to say how we learned it.(我们逐渐学习到一些知识，这些知识是我们很难解释我们如何学会的。)

It is hard to say to your parents "I want to devour and be devoured", even if you live in north London.(你很难对你的父母说“我想吃人，也想被吃”——即便你生活在北伦敦。)

Critics say that would extend copyright to facts. It would also be hard to make either regime work in practice.(反对者则认为，这一做法将把版权扩展到事实领域。)

It's going to be hard to say whether... he saw what came because everything came with such speed and power.(这将是很难说…他看到了后来因为这件事这样的速度和力量来了。)

The most hard-nosed realists, including some of the diplomats sitting behind their foreign-minister bosses, say that extraordinary compromises will have to be made, particularly on women’s rights.(但是最顽固的现实主义者，包括一些身后有各国外交部老大撑腰的外交官们，表示：必须要达成一些特殊妥协，尤其是在妇女权利方面。)

Hard to say, as the last few weeks have been turbulent times for world financial markets, which makes it difficult for any IPO to be successful.(这很难说。因为过去几周，全球金融市场呈现震荡态势，任何IPO想要成功都不是件容易的事。)

“But the prose and the poetry match up, ” he said. “It would be very hard for people to look back and say, You know what, Obama didn’t do what he’s promised.(“但是诗与散文得搭配起来，”他说，“你知道么，回顾并说‘奥巴马没有做到他承诺的‘对人们来说是非常困难的。)

When that is hard, because a parts supplier is highly specialised, say, good management is likely to be more effective than state aid.(当经济情况很糟时，由于零部件供应商是高度专业化的，良好的管理远比国家援助更有效。)