Up-and-down crossing是什么意思？

• BARRIE
• passage
• erased
• 分配英文
• searches
• neck
• peeping
• explore
• chess翻译
• algiers
• scared
• autumn
• theatre
• reveal
• silver
• tomato
• ultra
• profile
• PEGGING
• mind
• conflict
• toxicity
• candy
• volume
• monitor
• 实施英文
• organizations
• brat
• bombarded
• intermission

• searches
• committing
• juice
• banger
• disappointed
• lesson
• 确认英文
• general
• lake
• default
• ticket
• predict
• amazing
• 领域英语
• text
• pear
• client
• cloud
• firmness
• passage
• giraffe
• 局外人英文
• begins
• satisfaction
• 纪念品英语
• 参与者英文
• saturday
• 队长的英文
• aspect
• vehicle

• definitiveness
• definitude
• deflagrability
• deflagrate
• deflagration
• deflagrator
• deflaker
• deflashing
• deflate
• deflation
• deflationary
• deflect
• deflection
• deflective
• deflectivity
• deflectometer
• deflector
• deflectoscope
• deflegmation
• deflexion
• Defloat
• deflocculant
• deflocculate
• deflocculation
• defloration
• deflorescence
• deflower
• defluent
• defluidization
• defluorination