Error is often the precursor of what is correct.错误常常是正确的先导.Real tennis, an ancient precursor of the modern game, originated in the eleventh century.室内网球，现代网球运动的古老前身，起源于11世纪。Error is often the precursor of what is correct...
The pinch valve vault and control structures could be built around the existing live interceptor.夹管阀的拱顶和控制结构可以配置在现有的洪水拦截系统周围....the vault of a great cathedral.一座大教堂的拱顶He could easily vault the wall...他可以轻松地翻过墙去。He ordere...