These small tablets contain one drop of hydrochloricacid 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。
2
Or add iron to hydrochloricacid 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。
3
Common acidic agents in chemical burns include sulfuric acid found in car batteries, sulfurous acid found in bleach, and hydrochloricacid used in swimming pools.