延长: lengthen; extend; prolong; p ...使用期限: lifetime; operating life长使用期限: long life长使用期限, 长寿命: long life延长的使用期限: extended service life长使用期: high time延长使用寿命: increase of service life使用期限: campaign; durability; duration; expiration date for use; length of life; length of vitality; life span; life time; life-span; lifetime; limit of age; live time; operating life; operating period; operatinglife; operation date; operation life; period of service; period of usage; physical life-time of building; pot life; service age; service life; serviceable life; term of life; terms of service; time limit of service; used life; useful life; work life; working service油使用期限: life span of oil长使用期润滑脂: long-life grease变量使用期限: lifetime of variable额定使用期限: rated life飞机使用期限: aircraft life飞行使用期限: flying life估计使用期限: endurance expectation经济使用期限: economical service life老化；奉命；使用期限: age年龄；老化；使用期限: age平均使用期限: average life time; average useful life; mean life全部使用期限: entire life燃料使用期限: charge life; fuel life润滑使用期限: lifetime lubricated设计使用期限: design life; design service life; service life使用期限保险: life insurance使用期限操作: life operation
