Sodium is an essential mineral which means it is vital for the human body.

钠是一种非常重要的矿物质这也意味着它对于人类身体健康意义重大。

STEP 8 Eat healthy foods, like salmon, spinach, walnuts, and Brazil nuts, which contain vitamins and minerals essential for shiny, healthy hair.

食用健康的食品，比如鲑鱼，菠菜，核桃，巴西坚果，其中含有丰富的维他命和矿物质，对于光泽健康的头发来说是必须的。

That will " ensure that you strip away any unwanted hardness from the water and leave behind the essential minerals required to extract the optimal coffee flavour" .

这将“确保你从水中去除任何不需要的硬度， 并留下提取最佳咖啡风味所需的必需矿物质” 。