护照的有效使用期至少为六个月。
Its period of validity should be available for six months at least.
结果表明，经过大修改造的漏斗车可延长有效使用期。
The result shows that the effective service life of the overhauled and reformed hopper car can be prolonged.
上述优惠套装所包括之高球练习券有效使用期为三个月。
The validity of golf coupons that including in the captioned packages are for 3 months.
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