人们提出了许多理论来解释食草动物，如浮游动物，在控制浮游植物高度集中地区的食草动物方面所起的作用。

Many theories have been formulated to explain the role of grazers such as zooplankton in controlling the excluded grazers from regions of high phytoplankton concentration.

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手动更改的模糊量，饱和度，亮度，对比度，和其他设置内部和外部的集中地区。

Manually change the amount of blur, saturation, brightness, contrast, and other Settings inside and outside the focused areas.

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采取防燃、尘措施，在人口集中地区存放煤炭、矸石、煤渣、灰、石、灰土等物料的。

Storing coal, coal gangue, coal cinder, coal ash, sandstone, lime soil or other materials in densely inhabited areas without taking any measures for fire and dust prevention.

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Chiefly what we hear about is in the area of the Nile Delta, right there on the Mediterranean Sea.

绝大部分都集中在,尼罗河三角洲地区,就在地中海入海口

耶鲁公开课 - 古希腊历史简介课程节选