the course of the river became more tortuous as we neared its source

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English	Russian
course of the river became more tortuous as we neared its source	по мере того, как мы приближались к верховьям реки, русло её становилось всё более извилистым
the course of the river became more tortuous as we neared its source	по мере того, как мы приближались к верховьям реки, русло её становилось всё более извилистым