与单独飞行的鸟类相比,以 V 形飞行的加拿大鹅在没有休息的情况下可以多飞17%。
Canada geese flying in a V shape can fly seventeen percent farther without having a rest than the birds flying alone.
自1914年以来,科学家们已经知道,以V字形队形飞行的鸟类消耗的能量更少。
Since 1914, scientists have known that birds flying in formation—a V-shape—expend less energy.
与单独飞行的鸟类相比,以V形飞行的加拿大鹅在没有休息的情况下可以多飞行百分之七十的距离。
Canada geese flying in a V shape can fly seventy percent farther without having a rest than the birds flying alone.
Get out of your mind Henry V, forget the Battle of Agincourt.
忘掉亨利五世,1415年英王亨利五世于法国北部阿金库尔村以弓箭手重创兵力数倍于己的法军
If you think of two towns down here, Brive,b-r-i-v-e,famous for its rugby, and Tulle,t-u-l-l-e,which is a capital.
如果你可以想起来这儿的两个城镇,布瑞福,b-r-i-v-e,以英式橄榄球运动而负有盛名,图勒,t-u-l-l-e,是一个省的首府
And the point is that the second derivative of A, with respect to V and T in this order is the same as the second derivative of a with respect to T and V in this order.
问题的关键在于A的二阶导数,对V和T以这样一个顺序求导,和对T和V以这样一个顺序,求导是一样的。
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