difficult to ascertain

The causes of unhappiness in the past and in the present are not difficult to ascertain.

过去和现在的不幸根源不难查明.

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The manner in which global warming may be influencing the weather is difficult to ascertain, potentially covering events from floods and hurricanes to droughts and loss of biodiversity.

难以确定全球变暖正在以何种方式影响天气，洪水、飓风、干旱、生物多样性丧失等可能都是其体现。

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as the direct bid is outside the dealer network, it is difficult for the market to ascertain who the buyer is.

由于直接竞标不在交易商的掌握之中，市场很难判断出谁是买家。

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It can be difficult to ascertain the facts.

可能难以查明事实真相。

《牛津高阶英汉双解词典》

because of the value of art work is difficult to ascertain, in actual operation, art insurance generally use valued policy.

由于艺术品的价值难以确定，在实际操作中，艺术品保险合同一般采用定值保险合同形式。

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It is difficult to ascertain the exact duration of protection.

要弄清确切的予防有效期并不容易.

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this may be difficult to ascertain, but it's worth a shot.

也许很难说的准，但是值得一试。

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It has been difficult to ascertain the correct source of origin.

要查实材料的正确起源很困难.

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How to select slurry cement's concentration and cement's solidification time of deep-layer mixing pile and compressive strength's measurement of the pile now have been a problem which difficult to ascertain for the designers.

深层搅拌桩的浆液浓度（水泥掺量）、龄期（水泥土固化时间）、桩的抗压强度测试方法等的选择，如今是设计人员捉摸不定的难题。

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It's difficult to ascertain the coal deposits.

煤储量很难探明.

《现代汉英综合大词典》

try to notice if people seem friendly and happy. this may be difficult to ascertain, but it's worth a shot.

此时你可以观察周围的同事，看看他们是否友好和快乐。也许这是很难确定的事情，但是值得一试。

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it is difficult to ascertain an efficient dominating set of a graph.

通常要判断一个图是否存在有效控制集是困难的。

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the essay introduces the source of" yang xiong's trinary system", and analyses the reasons why it is difficult to ascertain each number.

通过对扬雄三进制由来的揭示，继而论证了各数难以确认的原因；

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