If you have an article of clothing with set-in coffee or tea stains, don't despair. Just soak it in a solution of 1 unit vinegar to 2 units water and then hang the item to dry in the sun.
不要对衣服上的咖啡渍或茶渍感到绝望，把衣服泡在醋和水1：2混合的溶液里，然后放在阳光下晾干就好了。
2
An enzyme level ranging from about 0.5 to 500 or more tannase units (determined as hereinbefore described) per gram dry weight of tea may be used.
酶的用量为每克干茶叶用0.5 - 500或更多的丹宁酶单位(用如前所述的方法测定)。
3
Design parameters of desulphurization units were introduced for refining dry gas and LPG.