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- 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。
- Pythagorean tuning (09) A system of pitches based on perfect fifths and fourths. 畢氏調律(09)根據完全五度和完全四度的關係而定的音高系統。
- In the diatonic scale of C major the intervals from C to G, D to A, E to B, F to C, G to D, and A to E are perfect fifths, each consisting of three whole steps or tones and one half step or semitone. 在大C自然音阶， C到 G, D 到 A, E 到 B, F 到 C, G 到 D, A到E 为纯 五度，每组包含三个全音和一个半音。B 到 F仅包含三个全音，构成减五度。
- A red pencil-mark on the fifth page caught his eye. 在第5页上一个红铅笔记号引起了他的注意。
- I'd like to fly to Glasgow on the fifth of May. 我想5月5日飞往格拉斯哥。
- The boxer was laid out in the fifth round. 那个拳击手在第五回合中被击昏在地。
- He passed me one fifth of the cake. 他递给我五分之一个蛋糕。
- Nothing in the world is flawless and perfect. 世上没有十全十美的东西。
- Evening came, and morning came, a fifth day. 黑夜临，晨光现，是为第五天。
- The fifth progress payment is due in March. 第五期按进度付款于五月到期。
- The weather during our holiday was perfect. 我们度假时的天气好极了。
- He gave her a fifth of the total amount. 他给了她总量的五分 之一。
- 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 team has chalked up its fifth win in a row. 这队一连五次取得胜利。
- He is the fifth person to ask me the question. 他是第五个问我这个问题的人了。
- The naughty boy had to repeat the fifth grade. 这个顽皮的男孩不得不重读五年级。
- He didn't have perfect attendance this year. 他今年有缺勤。
- I have perfect trust in my friend. 我完全信赖我的朋友。
- After our fifth goal the match became a rout. 我队进了第五个球以後，对方一败涂地。
