船舶: shipping; boats and ships; v ...有效: effective; valid; efficaciou ...使用期限: lifetime; operating life有效使用期限3: effective age有效使用期: effective age; effective life; effective service life; useful economic life适用期（有效使用期）: pot life working life有效寿命；有效使用期: effective life有效使用: use efficiently最有效使用: highest and best use船舶有效功率: shieffective power长使用期限: long 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开工率(即设备的有效使用期与修理期之比): on-stream efficiency一次有效使用: one-time operation有效使用寿命: acceptable life; useful service life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
