clear on明白无疑的, 不难懂的clearadj.清楚的；明确的；明白(某事)的；清晰的；清澈的；晴朗的；头脑清醒的v.清空；清除；澄清；放晴；使明确adv.清楚地；彻底地n.空地clear cell carcinoma of kidney肾透明细胞癌clear synthetic baking varnish合成清烘漆clear up all outstanding debts还清积欠Clear Water and Rustling Trees水木明瑟clear cell carcinoma of vagina阴道透明细胞癌clearing out the interior heat清里泄热clear-cut division of labour明确的分工clear cell follicular carcinoma透明细胞滤泡性癌, 可见于甲状腺Clear Water Bay Peninsula South清水湾半岛南clearing house settlement sheet[经] 票据交换所清算表

1. The clear span of a bridge is the gap from the near edge of the next.
   桥梁的净跨，是自一个桥墩的近侧边到相邻桥墩近侧边之间的间距。