The leather industry must evolve or risk becoming obsolete.
解释:狐狸疑心大,刚埋下东西,旋即又把它挖出来。
世界上充满了这样的人,他们心目中令人满意的未来,实际上是对理想化过去的回归。
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.