"You are always going to have racism, you are always going to have sexism, you are always going to have classism, that is something that we cannot change in one fell swoop, but with work and efforts like what is being done at IMAN, we chip away at that, one person,one character, one idea at a time."

VOA: standard.2010.03.15

You cannot have a spring pulled only at one side, because then it will then accelerate with infinite acceleration in that direction.

你不可能对弹簧只施加一边的拉力,因为那样的话弹簧就会以无穷大的加速度加速,就在这个方向上

耶鲁公开课 - 基础物理课程节选

You cannot have a spring pulled only at one side, because then it will then accelerate with infinite acceleration in that direction.

你不可能对弹簧只施加一边的拉力,因为那样的话弹簧就会以无穷大的加速度加速,就在这个方向上

耶鲁公开课 - 基础物理课程节选