计算走过的平均距离。
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%。
I never meant my comments to be insulting, I just pointed out that it didn seem like we were in Europe because of the distance travelled.我从不是攻击的意味,我只是指出因为出行的距离让我们看上去都不像在欧洲了。