Forest decline is still poorly understood but leads to the loss of a high proportion of a tree's needles or leaves.

人们对森林衰退还知之甚少，但森林衰退会导致树叶和针叶大面积脱落。

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Smell has been the most poorly understood of our senses, and only recently has neuroscience, led by Yale University's Gordon Shepherd, begun to shed light on its workings.

嗅觉一直是我们的感官中受到了解最少的，直到最近，耶鲁大学的戈登·谢泼德领导的神经科学研究才开始揭示它是如何发挥作用的。

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New diseases are, by definition, poorly understood.

新的疾病，从它的定义就可以看出，我们对它知之甚少。

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And there's increasing research that shows a direct but poorly-understood link between relationships and physiological processes in the body.

VOA: standard.2010.07.29

Their root causes are poorly understood, but medical researchers suspect environmental factors are important.

WSJ: The Research Report: Slapping On a Skin Patch to Combat Hay Fever

After all, the triggering process is unfamiliar and poorly understood, which naturally leads to suspicion.

FORBES: With Its Australian Court Victory, Google Moves Closer to Legitimizing Keyword Advertising Globally

Last year a new bankruptcy law came into effect, but it is incomplete and poorly understood.

ECONOMIST: Bankruptcy in China