second order stream
Alternative form of ski track (a trail left by a pair of skis, or one artificially created for the purpose of skiing on).
present participle of son
a stream formed by the confluence of two first order streams, or of a first order stream and a second order stream
Capable of being perpetuated or continued.
生態学者は農業による流出の影響を評価するため、二次支流に沿った複数の地点で水質を測定した。
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