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The transition from isogamy to oogamy has apparently occurred multiple times during the eolution of animals, plants, and some algae, but how did such transitions occur

同配生殖向异配生殖转化多次明显地出现于动植物和一些藻类的进化过程，但是这种转化是如何发生的呢？

Because of detection limit the gold particles are not found independently in pyrite scheelite quartz and other minerals. So it is believed that submicroscopic gold are occurred in gold-bearing minerals as micro-inclusions or isomorphous atoms.

受检测手段所限在含金黄铁矿、白钨矿、石英等矿物中未发现独立金颗粒，所以我们倾向于寨上金矿次显微金呈微包裹体形式存在于载金矿物中或呈类质同象替代的原子形式存在。

The directions of seismic source rupture for 151 historical moderate strong earthquakes occurred in Yunnan region have been determined by using aftershock sequence data and isoseismal line data.

利用等震线和余震序列资料，主要研究了云南地区 1 51次中、强震的震源破裂方向资料，给出云南地区中强地震震源破裂的空间展布图像。

An earthquake of MS6.1 occurred 67 km north to Alertai in Xinjiang Uygur Autonomous Region（N 48°24＇,E 88°14′）on Mar. 13, 1996. The meizoseismal area was located in the Alertai Mountain range near the border between China and Mongolia. The major axis of isoseismal lines in the meizoseismal area was in NW direction.

1996年3月13日新疆维吾尔自治区阿勒泰市北约67km处发生MS6.1级地震（48°24′N，88°14′E），极震区位于阿尔泰山脉山脊中蒙边境附近，极震区等震线长轴方向为北西。

But suspended more than two months later, the issuer's mentality is doomed to subtle changes occurred.

但暂停2个多月后，发行人的心态，是注定要发生了微妙的变化。

Diurnal gas exchange for aspen, jack pine and black spruce indicated afternoon depression. In hazelnut, a second peak in Pn occurred in the afternoon.

欧洲杨、短叶松和黑云杉的日气体交换率均表现午后抑制，榛子在下午出现了第二个Pn高峰。

Diurnal peaks in Pn for three age shoots of jack pine and black spruce occurred in the early morning between 7∶00-8∶00 on sunny days. The maximal rates of Pn and gs were 7.5 μmol.m-2.s-1 and 0.11 mol.m-2.s-1 for 1-year-old shoots of jack pine and 6.1 μmol.m-2.s-1 and 0.11 mol.m-2.s-1 for 1-year-old shoots of blackspruce.

而短叶松和黑云杉3个不同年龄树枝的Pn和gs的高峰出现在早晨7∶00到8∶00，其值分别是短叶松一年龄树枝为7.5 μmol.m-2.s-1和0.11 mol.m-2.s-1，黑云杉一年龄树枝6.1 μmol.m-2.s-1和0.11 mol.

Fortunately all four problems occurred near a town, remarkably good luck for someone traversing the vast open distances of the Great Plains in an old jalopy.

对一个开著老爷车横跨大平原的人来说，他实在很幸运，因为所有的四个问题都发生在小镇附近。

It occurred to me that he was jealous.

我想起了他是有嫉妒心的。

MCC occurred in front of low air jet stream.

MCC出现在中低层偏南风急流轴的前端。

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。