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- Thus C to F flat is a diminished fourth, with the upper note of the perfect fourth C to F lowered a half step or semitone. C到双降D（相当于C到C，键盘上的 一度），减二度较减七度或减五度不常用。
- Harmony ,in consonant intervals of perfect fifths, unisons, octaves, (and later, perfect fourths) begins to be notated. 协和的纯五度音程、纯一度、纯八度（以及后来的纯四度音程）开始渐渐被记谱法标记。
- Time is sometimes called the fourth dimension. 时间有时被称为第四度空间。
- In the diatonic scale of C major the intervals from C to F, D to G, E to A, G to C, A to D and B to E are perfect fourths, each consisting of two whole steps or tones and one half step or semitone. 在大C自然音阶， C到 F, D 到G, E到A, G 到C, A 到 D ，B 到 E为纯四 度，每组包含两个全音或半音。F 到 B,包含三个全音，构成增四度，被称作三全音。
- Nothing in the world is flawless and perfect. 世上没有十全十美的东西。
- I am a soldier of the fourth cavalry. 我是第四骑兵部队的一员。
- Reserve double room June fourth to tenth inclusive. 预订双人房间，六月四日至十日，共六晚，望订妥复电。
- Mars is the fourth planet in order from the sun. 火星是太阳系的第四颗行星。
- The weather during our holiday was perfect. 我们度假时的天气好极了。
- The project is far from perfect. 这项企划很不完美。
- What's the secret of baking perfect bread? 烤出好面包的秘诀是什么？
- The 800m is the fourth event of the afternoon. 800米赛是下午的第四项比赛。
- The twins will enter the fourth grade this fall. 这对双胞胎今年秋季将升到四年级。
- He didn't have perfect attendance this year. 他今年有缺勤。
- Her fourth husband was a middle-aged playboy. 她的第四任丈夫是一个中年的花花公子。
- I have perfect trust in my friend. 我完全信赖我的朋友。
- They live in perfect accord with each other. 他们生活在一起十分融洽。
- He has perfect poise and never seems embarrassed. 他的神智安宁，似乎从没困惑过。
- On that occasion he looked a perfect fool. 在这个场合，他看起来就像一个大傻瓜。
- The fourth letter of the Hebrew alphabet. 希伯来第四个字母希伯来语字母表中的第四个字母
