a small toothed whale with a low triangular dorsal fin and a blunt rounded snout
鼠海豚。
move through the water like a porpoise, alternately rising above it and submerging
(像海豚一样)起伏移动,颠簸
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the boat began to porpoise badly .那只船开始剧烈地颠簸起来。
"Middle English: from Old French