a long switchback descent
长而弯曲的下坡路
a long switchback descent
长而弯曲的下坡路
The stream switchback through hills and trees.
小河在山峦和树木间蜿蜒流去
Even at this hour it was acrawl with men, builders pushing up a new switchback stair to join the remnants of the old.
即它现在上面挤满了人,工匠正将新的梯子接到旧的上。
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