Sidney's talking about the various kinds of discourse: - divinity, hymnody, science, philosophy, history-- in other words, all the ways in which you can contribute to human betterment and human welfare. He says in the case of all but one of them, each discourse is a "serving science."

西德尼进行了很多方面的阐述：,神学，赞美诗，科学，哲学，历史-,换句话说，所有你能想到的,对人类福祉有益处的方式,他说这里面除了诗学，其他都是“服务性学科“