投资学的英文：
investment
investment principles
n. 投资（额）；投入；可投资的东西
- invest material
覆盖材料 - profits and losses on disposal of investments
转让投资的损益 - He bought it purely as an investment.
他纯粹是作为投资而购买的。 - Antiques are a very safe investment.
古玩是一种非常保险的投资对象。 - Networking is an investment not a nuisance.
人际网络是一项投资而不是浪费。
n. 原则，原理；起源；主义；道义
- principle of discrimination
区别原则[指战时区别军事/非军事目标] - Adhesion to the principle of independence and abstract is infraction of the principle of honesty.
固守独立抽象原则是有悖于诚实信用原则的。 - He was a man of the highest principles.
他是个道德崇高的人。 - To instruct in a body of doctrine or principles.
传授以教条或信条的方式来教授、教导 - The principle or law that orders the universe.
（佛教的）法约束天地万物的规则或法律