蒸馏水

rú guǒ bǎ tiě fàng zài wú kōng qì de zhēng liú shuǐ li shēng xiù de sù dù jiù bǐ shuǐ zhōng yǒu kōng qì de qíng kuàng yào màn

如果把铁放在无空气的蒸馏水里，生锈的速度就比水中有空气的情况要慢。

If iron is kept in air-free distilled water, then it is not so fast as when air is dissolved in the water.