nosing楼梯: stairs; staircase; stairway踏: step on; stamp on; tread级: level; rank; grade的: 4次方是 The fourth power of 2 i ...前缘: lip; snoot; leading edge下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:楼梯踏级的前缘,即可在微信中查询翻译