我们要脚踏七三五， 想到渔场万对船。 当我们站在“七三五”这艘船上时，我们不应该只考虑自己的利益，而是应该多为渔场里别的渔船考虑，它们也需要打渔。

求语境

It's from an old book, 连环画选辑

Where did you find this sentence?I need to say this is not what we say in our normal life,maybe it's a riddle or something else?