The leading edge of each level of the stairs是什么意思？

• giraffe
• fake
• BARRIE
• begins
• toxicity
• autumn
• amazing
• lake
• approaches
• rice
• droplets
• default
• 分配英文
• permitted
• 队长的英文
• supper
• repeat
• bothering
• modernize
• 解决方案英文
• committing
• text
• explore
• searches
• peeping
• emergency
• passage
• 方案英语
• 缺陷英文
• 参与者英文

• silver
• 导师英文
• juice
• satisfaction
• client
• lycopene
• lesson
• banger
• pear
• general
• panicked
• narrow
• firmness
• chess翻译
• maths
• 长颈鹿英语怎么说
• ticket
• 来源英语
• organizations
• failure
• prompt
• various
• 局外人英文
• 流浪者英文
• general
• conflict
• vehicle
• searches
• 呼吁英语
• 抛弃英文

• nucleus
• nuisance
• numerous
• nylon
• objection
• objective
• oblige
• observer
• obviously
• occasional
• occasionally
• occurrence
• odd
• odour
• off
• okay
• omit
• oneself
• opening
• operational
• operator
• opponent
• opportunity
• oppose
• oppress
• optical
• optional
• orbit
• orchestra
• orderly