请翻译以下英文Deal with forgetfulness, has the following several wa

请翻译以下英文
Deal with forgetfulness, has the following several ways: 1. Clear understanding learning content, not a little knowledge; 2. Try to eliminate all kinds of outside interference; 3. Often recall and review the knowledge learned; 4. To go step by step, to avoid nervous and irritable; 5. Pay attention to the mix, ensure that sleep, general continuous learning should not be more than 1 to 1.5 hours. Some people in order to improve memory effect, taking physical supplements or hard drugs for brain overcome forgetfulness, these are not desirable.