释义 |
fish laddernounA series of pools built like steps to enable fish to ascend a dam or waterfall.A fish ladder was built into the 29-foot-high dam....- City officials proposed using the revenue to cover the cost of removing 620 miles of road, building fish ladders, and other environmental protections.
- Dams prevent upstream migration of adult salmon, but this can be overcome to some extent by the construction of fish ladders in which the salmon jump up a long series of waterfalls.
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