It gives honey a pH value of less than 4.

它使得蜂蜜的 pH 值小于4。

But the overabundance of CO2 in the atmosphere has gradually decreased the pH value of the Earth's oceans, foreshadowing a catastrophic loss of marine life and vital ocean ecosystems.

但是由于大气中二氧化碳过剩，导致海洋的pH值逐渐降低，预示着海洋生物和重要的海洋生态系统的惨重损失。