A university horticulture instructor, for example, can't just talk about vegetation; he must have a green thumb. A horticulturist or a florist must know the special characteristics of various plants and even know what they symbolize in mythology or literature and any relevant anecdotes; otherwise, they won't be able to convince people to fork over the exorbitant amounts of money they are asking.
就像大學園藝系老師不能只「說」得一口好植物，必須要培養蒔花養草的綠手指本事；從事園藝或者開設花店的老闆，也必須懂得植物的生長特性，甚至它們在神話或文學中的象徵與典故，才能打動顧客的心，讓顧客甘願付出高價購買。