石沉大海的英语:like a stone dropped [sank] into the sea ― no echo; (like) a pebble dropped in the sea; as if a stone were sunk in the deepest bottom of the sea; (it was as though) a stone were dropped in...
石沉大海的法语:il ne s'est produit aucune réaction,c'est comme une pierre jetée dans la mer sans réponse.