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this is being writen paper The long-term change trend of sediment yield and runoff can be divided into two periods. For the first period -2002 to 2009-sediment-carrying capacity of runoff was large. In the second period -2010 to 2016- its capacity was reatively little.

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This is being written in a paper

The long-term change trend of sediment yield and runoff can be divided into two periods. For the first period, 2002 to 2009,  the sediment-carrying capacity of runoff was large. In the second period, 2010 to 2016, its capacity was relatively little.

[You can also enclose those year spans in parenthesis: For the first period (2002 to 2009) the ...]

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