However, remember the water is river water, and though it will have been filtered through the bed and bank, further treatment may be necessary (for example, chlorination).

然而，记住水是河水，并且河床和河岸可能已经过滤了它，但进一步的处理仍是必需的(例如，氯化处理)。

youdao

However, remember the water is river water, and though it will have been filtered through the bed and bank, further treatment may be necessary (for example, chlorination).

然而，记住水是河水，并且河床和河岸可能已经过滤了它，但进一步的处理仍是必需的(例如，氯化处理)。

youdao