On steep loose climbs, choosing the right gear picking a good line are key factors. Look ahead for sections of smooth rock or hard dirt for optimum traction.

如果遇到松滑的陡坡，关键因素在于选择适当的齿轮比和前进路线，尽可能找到较平滑的石头和较硬的泥土以确保有最佳的抓地力。

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That man picking up a rock - what was his real intention?

CNN: MEDAN'S MADNESS

We'd spend hours picking through the best of them, finding the perfect rock to skip across the river.

CNN: The seven stones of simpler living

Ideas and the people who had them became Rock's specialty, and he's had an uncanny talent for picking winners.

FORBES: Arthur Rock