煤炭行业是美国能源独立的支柱,已经持续了几代人。
The coal industry has been the backbone of America's energy independence for generations.
Learning is essentially a matter of stimulus-response connections.
从n对观测值的样本中获得的相关系数的可能误差是sqrt((1-r²)/(n-2))。
Behavior is determined by the total situation.
If you meet a jerk, overlook them. If you meet jerks everywhere everyday, look deeper into yourself.