将短文中划线部分的句子译成中文（共4分，每小题2分）
Friendship is one of the greatest pleasures that people can enjoy .A true friend does indeed find pleasure in our joy and share pity in our sadness . He or she is always at our side to give us his or her help .
Knowing how important friendship is ,we should be very careful in our choosing of a friend . We must choose someone who has a good character , who does everything good and who shows kindness of heart . We should avoid (避免) those people who are easily changed .