firth

n (esp in Scotland) narrow inlet of the sea; part of a river when it flows into the sea （尤指苏格兰的）狭窄的海湾, 河流的入海口.

first gear, first lady, first name, first night, first of all, first offender, first officer, first or last, first refusal, first school, first-aid, first-born, first-class, first-day cover, first-footing, first-fruit, first-hand, first-rate, firsthand, firstly, fiscal, fiscal year, fish, fish and chips, fish cake, fish finger (US fish stick), fish out, fish pond, fish weir, fish-eye lens, fish-farm, fish-hook, fish-kettle, fish-knife, fish-net, fish-plate, fish-slice, fisherman, fishery, fishing,