columns

2 篇文章
But these spiralling columns hundreds if metres high
Walden 21
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But these spiralling columns hundreds if metres high 这些高达数百米的螺旋型“烟”柱

spiralling columns metres hundreds if these high but
they use thermals, rising columns of warm air, to gain height.
Walden 21
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19 0 3

they use thermals, rising columns of warm air, to gain height. 可它们会利用热空气 ——呈圆柱形上升的热气流来获取高度

columns thermals use height gain rising air they warm of to
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