求翻译：采用直接滴定法[35] ，用标准碱液滴定食品中的酸，中和生成盐，用酚酞指示最终值。 再根据耗用的标准碱液的体积，计算出总酸的含量。具体步骤如下：是什么意思？

By direct titration method [35], titration with standard alkali food acid, and in the formation of salt, with phenolphthalein indicate the final value. Standard consumption according to the volume of lye, to calculate the total acid content. Specific steps are as follows:

[ 35] Using the direct titration, using a standard lyes titrimetry in food in the acid, salt, and generated using phenolphthalein ultimate value instructions. According to the standard alkali liquor consumption, calculated that the size of the total acid content. Concrete steps are as follows:

Uses direct titrimetric method [35), with the standard lye titrate food in acid, neutral lives the salifying, tai instructs the end value with the phenol. Again acts according to the standard lye volume which consumes, calculates the total acid the content.The concrete step is as follows:

Direct titration [35], standard alkali titration of acids in food, and when you generate salt, indicated by the phenolphthalein final value. According to the amount of volume of a standard alkaline solution, to calculate the total acid content. The steps are as follows:

By direct titration method [35], titration with standard alkali food acid, and in the formation of salt, with phenolphthalein indicate the final value. Standard consumption according to the volume of lye, to calculate the total acid content. Specific steps are as follows: