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Fertilization occurs at oviduct and development of the fertilized egg at uterus.

受精作用在输卵管内发生而受精卵则在子宫内发育。

In human, ovulation occurs regularly for every 28 days. The maturation of the ovum

在人类，每隔28天排卵一次，随著卵子的成熟，子宫内壁慢慢充血和变厚

When it's over 700℃, The oxidize layer occurs the phenomenon of sublimation which can influence thickness obviously.

当温度超过700℃时，氧化层明显发生升华现象而影响试片厚度。

Some metabolism of PABA occurs in the liver .

一些代谢不含 PABA 发生在肝脏中。

If there is a page fault, all the old values are written back into memory before the trap occurs.

如果有页面错误，则在自陷中断产生之前，所有原来的数值都要写回存储器。

If there is a page fault, all the old value s are written back into memory before the trap occurs.

如果有页面错误，则在自陷中断产生之前，所有原来的数值都要写回存储器。

It is possible that the alternation of black shale and CORBs occurs in certain units. By correlating the globally distributed CORBs from Barremian to Maastrichitian, this paper discussed the temporal and spatial evolution of CORBs and its implications for paleoceanography and paleoclimatology.

基于此，本人通过对贝雷姆阶到马斯特里赫特阶全球大洋红层的研究，对大洋红层的时空演化进行了探讨，并讨论了其古海洋、古气候意义。

Paleolithic art occurs all over the world but is most abundant in western Europe; and only the art of this area is considered here.

旧石器时代艺术发生在世界各地，但最丰富的是在西欧，只有艺术的这个领域被认为是这里。

In humans, still in paleolithic occurs when the original stone carving, bone.

在人类还处于旧石器时代时，就出现了原始石雕、骨雕等。

For example, the drug papaverine occurs in opium, but most papaverine comes from the laboratory.

例如，罂粟碱这种药存在于鸦片中，但是大部分罂粟碱是实验室生产的。

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。