Drinking off a glass of water refers to completely gulping down the whole (about 200-250ml) in one gulp, rather than sipping freely, thus the absorption by human body can best achieved.

• 一口气喝完一杯水。指一口气将一整杯水(约200至250毫升)喝完，而不是随便喝两口，这样才可令身体真正吸收使用。