一个有平直和棱角形状的物体在水中被移动会遭遇巨大的困难.
1995年8月2的托福考试题.
The fact that water is incompressible has literally shaped the development of fish.A flat and angular shape can be moved through water only with difficulty.And for this reason,fish have a basic shape that is beautifully adapted to deal with this peculiarity.