过去是你所记得的、想象你记得的、说服自己记得的，或假装记得的。
The past is what you remember, imagine you remember, convince yourself you remember, or pretend you remember.
可持续农业的未来在于生产力与环境管理之间的平衡。
The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.
The only thing I can say is that I try to be humble all the time.