translation.en: "To say that something is essential is ordinarily to say that it is necessary to the achievement of a certain object.
translation.zh: "说某样事物是具有本质意义的，等于在说它对能否完成某目标起决定作用" "说某样事物是具有本质意义的，等于在说它对能否完成某目标起决定作用" "说某样事物是具有本质意义的，等于在说它对能否完成某目标起决定作用"