给我五句英语中不同的谚语，每句话后面加上它的含义。
1. "An apple a day keeps the doctor away." - This means that eating a healthy diet can help prevent illness.
2. "Actions speak louder than words." - This means that what people do is more important than what they say.
3. "When in Rome, do as the Romans do." - This means that when you are in a different place or culture, it's best to follow the customs and behave appropriately.
4. "Don't count your chickens before they're hatched." - This means that you shouldn't make plans based on something that hasn't happened yet.
5. "All's fair in love and war." - This means that anything goes when you are competing for someone's love or in a war.