酸雨的定义:简单的说:任何形式的降水, 包括雪, 雨, 雹或微粒, 他们的含酸度(degree of acidity)高于大自然的正常情况，这就是酸性沉降。
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The degree of acidity or alkalinity of any solution, then, can be most conveniently expressed by the PH system.
因此 ，任何溶液的酸碱度都可以用PH体系来表示。 采用这种方法极为方便。
The processing of tomato vinegar were determined by the analysis of the degree of alcohol, acidity and sugar. The liquid fermentation conditions of tomato vinegar were optimized.
通过对酒精和醋酸发酵后酒度、酸度、糖度和还原糖等成分的测定，研究了液体发酵法酿制蕃茄醋的生产工艺，并优化了发酵条件。
The production of Gouda cheese's Key control point include ferment time, curd time, soft ang hard degree about the clot and the control for acidity.
同时对高达干酪的生产工艺在理论上进行了探讨。高达干酪生产主要控制点包括发酵时间、凝乳时间、凝块的软硬程度以及酸度的控制。
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