1.安静（queit,silence）：形容没有声音。 例句：当她唱歌时，整个房间都安静了。 When she sing songs, The room had gone silent. 2.和平（peace）：形容没有战争的状态。 例句：全世界人民都希望世界能永远和平。 All the people around the world hope the world to be peace forever. 3.和谐（harmonious）：形容配合适当、协调。 例句：①这首歌的音调很和谐。The music is harmonious. ②夫妻能和睦相处就是一种成就。To live together harmoniously as men and women is an achievement. Hi, Aaron. I‘m sorry my English is not very good so I can't translate the sentences with English well. If you still can't understand these words, you can send me a message.

安静 = quiet, serene, calm, at ease 和平 = peace 和谐 = harmonious. As in English, their usage is the same. 人心能安靜, 家庭和谐而世上可和平起來了. When the heart is calm, there will be harmony in the family and world peace can be achieved.