When occurrence problem of hormone level and oviposit, ovarian can fall ill.

当激素水平和排卵出现问题时，卵巢就会生病。

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The problem is that the compound has mixed effects in the brain, a not unusual occurrence with psychoactive drugs.

问题在于，这种化合物对大脑有混合作用，这种情况在服用精神药物时并不少见。

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Messages have variable data for each instance or occurrence of the element to identify the precise resource and other data required to fix the problem.

消息具有用于元素的每个实例或每次出现的变量数据，以标识修复问题所需的精确资源和其他数据。

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It's a common occurrence and not indicative of a problem, though it can appear more severe in some vehicles depending on how they are used, the design of their exhaust systems and other factors.

WSJ: How to Keep a Deer Out of the Headlights

"I had the problem a few years ago at the 2002 Commonwealth Games and never thought there would be a re-occurrence, " Pavey explained.

BBC: Jo Pavey receives assistance after the Great North Run