ratline
英 ['rætlɪn]美 ['rætlɪn]
n. 横索的梯绳（等于等于ratlin或ratling）
英文词源
ratline (n.)
"thin rope," especially as used on sailing ships, late 15c., originally ratling, of unknown origin; spelling ratline attested from 1773, by influence of line (n.).
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