lifefuladj.充满活力的；充满生气的lifen.一生；生命；生活；人生life system concept生命系统概念life cycle analysis生命周期分析life-only annuity生命给付年金life-cycle theory全寿命周期理论life characteristic寿命特性曲线life-long journey人生旅程life support module生命保障舱life and creativity生平创作life circle of firm企业生命周期life insurance firm寿险公司