The causes of the phenomenon are still incompletely understood.

造成这种现象的原因尚未彻底弄清。

《牛津词典》

It is a fast-in/fast-out feeder, relying on a high output of incompletely digested food.

它是一种新陈代谢很快的进食者，这一结论依赖于它们大量的排泄物都是那些没有未完全消化的食物。

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The mechanism of these changes is incompletely understood.

对这些变化的机制尚不清楚。

youdao

Untreated or incompletely-treated sufferers often have pain in their muscles and joints.

VOA: special.2011.07.26

So, some of these cases were probably due to polio that was transmitted by incompletely killed virus that was present in the vaccine.

因此,那些病例的发病的原因,是被那些疫苗中携带的,没有被完全杀死的病毒感染

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Aside from its effects on bone growth, its various effects are only incompletely understood.

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But bacteria are big and bulky, so they diffuse slowly and incompletely, which makes the tests less sensitive.

BBC: Rapid food poisoning analysis

Information trickled in slowly and incompletely as these events unfolded in real time.

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