他们在小舢板上漂浮了3个小时后才被发现。They were spotted after three hours adrift in a dinghy.他们说起自己设法使油轮漂浮的英勇之举时非常谦虚。They talked modestly of their valiant efforts to keep the tanker afloat.我们拼命往外舀水，使它继续漂浮了几个小时。We kept her afloat for a cou...
More often, all of the materials exposed to the etchant have a finite etch rate.通常, 所有暴露在刻蚀剂中的材料都具有一定的刻蚀速率.Hydrofluoric acid of Porcelain Etchant and phosphoric acid of UNI - ETCH are severe eye and tissue irritants.瓷酸蚀剂...