官员们对于会谈情况保持缄默.The officials maintained a wall of silence around the talks.我们不应对这件可耻的事保持缄默.We should not pass over this disgraceful affair in silence.侦探们犯了难，半岛上各个群体抱成一团，达成了保持缄默的密约。Detectives have run into a conspiracy of ...
硬水使壶生水垢.Hard water furs the kettle.硬水使水壶生了垢.Hard water furred the kettle.经过加入碳酸钠能被软化的硬水,称为永硬水.Hard water which can be softened by adding sodium carbonate is called permanent hard water....