Or add iron to hydrochloric acid and boil the solution to dryness.

又或者将铁放入盐酸中，然后将溶液加热变成结晶。

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These small tablets contain one drop of hydrochloric acid and they last about four hours.

这些小片剂每片含有一滴盐酸，药效持续四个小时左右。

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Your stomach needs plenty of hydrochloric acid to break down calcium carbonate, so always take your supplement with a meal or snack.

您的胃需要很多盐酸分解碳酸钙，因此请与饭或点心一起服用这些添加物。

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But this process also released large amounts of deadly hydrochloric acid gas.

VOA: special.2011.03.09

Hydrochloric acid was once used to retrieve metals from rock, but many firms abandoned it for cost reasons for cyanide.

FORBES: Firm Uses Cyanide--Free Method To Leach Gold, Other Metals

Stuart Lee, from Pillowell, admitted having hydrochloric acid, potassium cyanide and sulphuric acid which he stole from a business in Whitecroft.

BBC: Forest of Dean man guilty of explosives charge

Working with his students, Butz twice soaked the samples in a weak solution of hydrochloric acid to remove any contemporary soot stains.

WSJ: NY teacher delves into mystery of 'Indian Ovens'