1. black-and-white diving bird of northern seas. 
   北海黑白色的潜水鸟。
2. black-and-white short-necked web-footed diving bird of northern seas. 
   北海黑白色、短颈、蹼足的潜水鸟。
3. small stocky diving bird without webbed feet; frequents fast-flowing streams and feeds along the bottom. 
   小而矮壮的潜水鸟，脚无蹼；经常潜入急流的小溪，并沿底部觅食。
4. large somewhat primitive fish-eating diving bird of the northern hemisphere having webbed feet placed far back; related to the grebes. 
   北半球有些原生的食鱼大型潜水鸟，蹼足长得很靠后；与??有亲缘关系。
5. Are there diving events tomorrow? 
   明天还有跳水项目吗？

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