增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：
1．每处错误及其修改均仅限一词;
2．只允许修改10处，多者(从第11处起)不计分。
How much water should you drink each day? Studies have produced varying advices over the years. But your individual water needs depend many factors. Know more about your body's needs will help me estimate how much water to drink each day. Normal kidneys can release nearly a quart of fluid every hour. If you drink less than that, you'll keep the extra water in your body, that can be poisonous to your health. For the most people, drinking more than needed water is neither necessary or medically helpful. Normal day water intake is up to the level of physical activity and climate. It was recommended that men should not drink over 3. 7 liters and 2. 7 liters for women.
