奥巴马谈了所有关于非洲的合理之事，留下一些比较棘手的没有触及。
Barack Obama said all the right things about africa-and left a few ticklish ones unsaid.
Mr Morrison说，这是个棘手的事，因为供应商也许会担心为了碳量定而得去揭露他们有关过程的信息，这等于是开了个空子，容易引发价格战。
This is a tricky area, says Mr Morrison, because suppliers may worry that revealing information about their processes for carbon-measurement purposes "becomes a back door to a debate about price".
这一切中最棘手的也许是与或有负债，如银行保险计划，公共部门养老金计划等有关的问题。
Trickiest of all perhaps is the question of contingent liabilities such as bank-insurance schemes, public-sector pension schemes and the like.
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