barrier-free passage

常见例句

雙語例句

• A barrier composed of a chain of floating logs enclosing other free-floating logs, typically used to catch floating debris or to obstruct passage.
  一種由一連串浮木連著別的自由浮木而成的障礙物，特別用於攔截漂浮殘骸或阻止通行。
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