period of validity是什么意思？

• passage
• panicked
• cloud
• intermission
• 呼吁英语
• various
• lycopene
• front
• giraffe
• approaches
• 确认英文
• peeping
• passage
• searches
• candy
• cheese
• profile
• reveal
• crayon
• autumn
• algiers
• organizations
• disappointed
• begins
• supper
• ultra
• firmness
• 缺陷英文
• 分配英文
• predict

• emergency
• 权限英文
• general
• erased
• aspect
• 局外人英文
• 实施英文
• 方案英语
• committing
• narrow
• prompt
• 领域英语
• BARRIE
• 参数英文
• brat
• droplets
• lesson
• modernize
• general
• chess翻译
• fake
• 流浪者英文
• bombarded
• 导师英文
• explore
• 解决方案英文
• 来源英语
• tourist
• 旋律的英文
• maths

• be credited to
• be dedicated to
• be derived from
• be directed against
• be distinguished for
• be dotted with
• be dramatized by
• be exposed to
• be filled with
• be friendly with
• be heavily forested
• be held in position
• be honored with
• be in the hands of
• be left for dead
• be limited to
• be located on
• be obliged to
• be patterned on
• be paved with
• be put in chains
• be recognized as
• be related to
• be reported as
• be restricted to
• be secreted from
• be short of
• be substituted for