与10%碳酸钠溶液 ( 50毫升 ) 混合搅拌,然后再用50毫升水混合搅拌, 从而析出固体.It is stirred with 10 % sodium carbonate solution ( 50 ml ) and then with water ( 50 ml ), after which It'solidifies.经过加入碳酸钠能被软化的硬水,称为永硬水.Hard water which can be softene...
The cold, misty air felt wonderful on his face.雾蒙蒙，寒冷的空气使他脸上感觉很舒爽。The volume of scheduled flights is straining the air traffic control system.定期航班的数量正让空中交通指挥系统不堪重负。The outside air was heavy and moist and sultry.外面的空气沉滞、潮...