| 单词 | guardrail |
| 释义 | guardrail /gahrd"rayl'/, n. 1. Also, guardrailing. a protective railing, as along a road or stairway. 2. Railroads. a rail laid parallel to a track to prevent derailment or to keep derailed rolling stock from leaving the roadbed. [1825-35; GUARD + RAIL1] |
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