In no way can sport be considered a luxury object.
用正途去辅助别人,这便是忠诚。用歪魔邪道去引导别人,着便是奸佞。
相关系数的可能误差不是可以从第一原理推导出来的东西,而是必须通过经验找到的。
Fearless is not the absence of fear. It's not being completely unafraid. It's having a lot of fears, but jumping anyway.