washboard
n board with ridges on it used (esp formerly) for rubbing clothes on when washing them 搓板.
🗣️ 情景例句
You've been very thoughtful.
你一直都很周到。
Which would you rather have--steak or fish?
你想要牛排还是鱼?
and near its lower reaches there is a long tailing-off which is almost certainly the result of material transported out to deep water after being eroded from the continental masses.