Mathematics is not a spectator sport. You have to do it to understand it.
我相信理解市场心理和投资者心理是至关重要的。
The problem with defending the purity of the English language is that English is about as pure as a cribhouse whore. We don't just borrow words; on occasion, English has pursued other languages down alleyways to beat them unconscious and rifle their pockets for new vocabulary.