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It occurs most commonly during the third trimester of parturition,...

它最常见的发生在第三季度分娩，。。。

Another problem that sometimes occurs with paspalum is disease- if the shoot tissue looks brown and torched, it can be disease.

另一个问题是，如果幼苗叶尖看上去是褐色或者焚烧状，它可能已经感染疾病。

This occurs in Chaucer passim.

这在乔叟的作品中处处可见。

Peach fruit moth, Carposina sasakii Matsumura is a important fruit pest of many fruits, it occurs differently on different fruit tree.

桃蛀果蛾是危害多种果实的重要果树害虫，在不同种果树上的发生规律有明显不同。

Pearlite obviously occurs in the structure under lower cooling speed(2℃/s).

冷却速度较低( 2℃/ s)时，组织中出现明显的珠光体。

An experienced hunter, Peckinpah was fascinated with guns and was known to shoot the mirrors in his house while abusing alcohol, and this image occurs several times in his films.

作为一名有经验的猎手，佩金帕着迷于枪械，曾在饮酒过量后对房间里的镜子开枪，这一场景在其影片中也多次出现。

Quartz core zones: Mineralisation occurs in enclaves of albitisation around the core of the pegmatite.

1石英核心带：矿化作用存在于被纳长石矿包围的伟晶岩核心。

Subaerial erosion occurs often with reduction to a peneplain.

陆上侵蚀常夷平成准平原。

The negative pressure is a result of a penstock valve closure and only occurs in a small section of the penstock immediately downstream of the valve.

负压力的产生是由于水道阀关闭的结果，并且只发生在位于阀下游的一小部分水道中。

Perchlorate naturally occurs in soil but is also produced for use as rocket fuel and explosives.

高氯酸盐自然地被发现在土壤中，但它也被生产，作为火箭燃料和炸药。

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。