soils which are broken down
A property of a substance that is not seriously affected by impurities or imperfections in the crystal structure.
Large cities are cities that have large populations relative to a country's total population. Although there are no established international standards, generally a city with 5% ...
different categories in a plan of action
sediments belonging to those geologic times (Tertiary and Quaternary)
processes ocurring with the formation of numerous, closely spaced rills due to the uneven removal of surface soil by streamlets of running water.
To damage or destroy, as by forceful contact
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skills or abilities in oral speech, ability of speech, fluency in speaking
约翰内斯堡, 南非
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