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The level of contagion is low, but occasionally meningococcus can occur in outbreaks and become a serious cause of morbidity and mortality.

虽然传染率并不高，脑膜炎球菌有时可能突然爆发，导致发病乃至死亡。

Menses become irregular, and heavy breakthrough bleeding can occur.

月经变得不规则，会发生严重的突破性出血。

More information is needed on variation within populations, particularly in mericarp morphology, to assess the status of the awnless species of Sida , as there are indications that awned and awnless mericarps can occur on the same plant, thereby suggesting a possible reduction in species numbers.

更多的信息被在居群内在变化上需要，特别是在分果爿形态学方面，评价Sida的awnless种的地位，éveill é作arvensis那些Scrophulariaceae Merrill(花期，看见中国18： 86.1998)。

One way is to use risk metalanguage (a formal description with required elements) to provide a three-part structured "risk statement", as follows :"As a result of , may occur, which would lead to ."

有一种方法是使用风险元语言（一种包含必要元素的正式描述）提供一个由三个部分组成的"风险陈述"，即"作为确定的原因引起的结果，不确定性事件可能发生，而不确定性事件又会导致对目标产生的后果。"

And if the magnetic order is disrupted, then certain remarkable changes, certain remarkable metamorphoses in the electromagnetic vibrations of this Earth and also of the entire solar system, will occur.

如果磁场的秩序混乱了，那麼这个地球上的电磁波，以及整个太阳系都会产生显著的改变、变形。

His family will be well prepared for the metamorphosis that may occur.

父母对孩子身上可能发生的巨大变化将有充分的准备。

Curvilinear calcification suggests an aneurysm but is a less specific finding because it can also occur in craniopharyngiomas and sphenoidal masses. The intense enhancement of the residual lumen is relatively specific, but differentiation from other masses may be difficult on CT scans depending on the timing and degree of vascular enhancement. The MR imaging features are usually diagnostic, although they can be very subtle [2]. Significant signal heterogeneity is seen with T1 hyperintense signal due to subacute thrombus or flow related enhancement. Areas of T2 hypointensity can be seen due to intracellular deoxy or methemoglobin, calcification, or flow void.

线样钙化提示动脉瘤，但不是一个非常特异的征像，因为这也可以见于颅咽管瘤和蝶骨肿瘤，管腔样明显强化更特异些，但是在CT上与其他肿瘤鉴别可能是困难的，因为这取决与增强的时间与血管强化的程度，MR的特征性表现是更具有诊断意义的，即使有时候可能表现的非常细微，在T1上可以看到明显的不同信号成分，这是由于亚急性的血栓或流动相关增强效应，T2序列上可以看到低信号区域，这是由于细胞内脱氧或高铁血红蛋白，钙化，或流空效应。

Hemolytic anemia, enlargement of the spleen, and pathologic changes in the liver, kidneys , and heart muscle may occur as secondary effects of methemoglobinemia, which is reversible.

作为高铁血红蛋白症的次要影响，会发生溶血性贫血、脾扩大和肝、肾、心肌的病变，这些影响是不可逆转的。

In fact, the human and mice may also occur as such a thing....

其实，人和老鼠一样也会发生这样的事情。。。。

Therefore, it is important to discover the existence of the microcrack in time before the marine accidents occur.

因此，在发生海损事故前，及时发现各构件存在的微裂纹是十分重要的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。