Epsom salts

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Try taking nice hot bath with Epsom salts to help relieve some of your back pain.
试试用泻盐好好洗个热水澡，对减轻背痛很有效的哦。
The tanks are slightly larger than a twin-sized bed, filled with 10 inches of body-temperature water and about 800 pounds of Epsom salts.
浮箱的面积比双人床稍大，里面装有齐膝深的温水，水中溶解了360公斤的浴盐。
I cup of Epsom salts (magnesium sulfate) added to your bath water will relax your nervous system, draw out toxins, relax muscles and even reduce swelling.
在水中放一杯泻盐（硫酸镁）可以舒缓你的神经系统，排出毒素，放松肌肉，甚至可以减轻浮肿。

a bitter white powder that is mixed with water to make a drink that helps people pass solid waste

Epsom salts is a kind of white powder that you can mix with water and drink as a medicine to help you empty your bowels, or add to water that you soak your feet in.