The greatest problem for mathematicians now is probably the Riemann Hypothesis.
我们联邦中每个家庭的感激之情都献给那些为我们的国家服务而战斗和牺牲的勇敢的人们。
在热量下降过程中,动力显然随冷热物体之间的温差增大而增加。
I don’t let negativity affect me, I let it motivate me.
Quality is not an act, it is a habit.