The distance travelled per tail stroke also fell, by 13%, when mothers were accompanied by their young.

当母海豚有她们的幼儿陪伴时每次尾部击打的间隔距离也下降了13%。

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The Bore is the diameter of the cylinder. The stroke is the distance the piston travels from BDC (Bottom dead center) to TDC (top dead center). The Bore is always mentioned first.

内径指的是气缸的直径；行程是活塞从下止点运行到上止点的距离。表述时，内径总是写在前面。

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In medley relays, each swimmer swims one stroke for the set distance; the order is backstroke, breaststroke, butterfly, and free style.

混合泳接力赛中，每位运动员以一种姿势游一定的距离，(泳姿势)顺序依次是仰泳，蛙泳，蝶泳和自由泳。

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He points out that a team of basketball players can win, at most, one gold for their country, while a swimmer can win two golds for swimming the same stroke the same distance twice: once individually and once as part of a relay team.

WSJ: 2012 London Olympics: Do Gold Medals Matter More Than Total Medals?

Calves swimming in echelon showed a 28% increase in average swim speed and a 19% increase in distance per stroke.

ECONOMIST: Another reason why infant dolphins need their mothers

The distance travelled per tail stroke also fell, by 13%, when mothers were accompanied by their young.

ECONOMIST: Another reason why infant dolphins need their mothers