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.
The only limits you have are the ones you set for yourself.
可持续发展已不再是选择，而是任何希望在未来蓬勃发展的企业的必需品。
"Every saint has a past, and every sinner has a future."
