In the late autumn period, it may be more difficult to rule out late - moulting Vega Gulls if we are to use "white heads" as our main method of separating the two.

在秋季后期，我们如果主要是利用头部全白与否来分辨这两种，那就很难排除那些换羽较迟的织女银鸥个体。

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Henry VIII (rule 1509-1547 A.D.) : England prospered in the 16th century, and as a result, it became increasingly difficult to tell the merchants from the middle class from the nobility.

亨利八世(1509年至1547年在位)：16世纪的英国经济繁荣，这使得来自中产阶级的商人和上层阶级的贵族从外貌上难以区分。

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Rule of thumb is... If you find that a person is super picky, very opinionated, unprofessional, or difficult to work with up front….

当你发现一个人超级挑剔、偏执、不专业，很难再和他一起工作的时候。

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The economic damage caused by such allegations can be severe, a fact surely not lost on the OECD bureaucrats indeed the depth of the errors makes it difficult to rule out malice as a motivation.

FORBES: Using Joe And Jane's Money, The OECD Exploits Joe And Jane

India had become steadily more difficult for Britain to rule and without India, British hegemony in the Middle East, deemed a core national interest until the disaster of Suez in 1956, was increasingly unsustainable.

ECONOMIST: The British empire: Pondering the past | The

And private equity would find it much more difficult to function without the rule that allows interest to be tax-deductible.

ECONOMIST: The unintended consequences of past financial reforms