As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

释义：上顺应于天，下取悦于民。使民众喜悦，人民便忘记了劳苦；用喜悦战胜困难，民众就会忘掉死亡的威胁，喜悦的作用太大了，它能勉励民众！

水产养殖中最危险的一句话是"我们一直都是这么做的"。