由于他们的切向速度是零在墙壁上的翻译：Because of their tangential velocity is zero on the walls 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Their tangential velocity is zero at the wall

Because of their tangential velocity is zero on the walls

Because their tangential speed is the zero on the wall

Because of their all to speed is zero in on the wall

Because of their tangential velocity is zero on the walls