reef knotˈreef knot noun [countable] especially British English 
a double knot that cannot come undone easily SYN square knot American English
a double knot that cannot come undone easily SYN square knot American English
| 单词 | reef knot |
| 释义 | reef knotˈreef knot noun [countable] especially British English a double knot that cannot come undone easily SYN square knot American English |
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