8 sentences

1. 弦绷得太紧了，容易断。

   xián bēng de tài jǐn le, róng​yì duàn.

   The string is stretched too tight and might break easily.

   Source: Dong Chinese Dictionary

2. 他的小提琴断了一根弦。

   tā de xiǎo​tí​qín duàn le yī gēn xián.

   A string on his violin snapped.

   Source: Dong Chinese Dictionary

3. 他用弹片拨动着吉他弦。

   tā yòng tán​piàn bō​dòng zhe jí​tā xián.

   He used a pick to pluck the guitar strings.

   Source: Dong Chinese Dictionary

4. 这种乐器通过弦的振动而发音。

   zhè zhǒng yuè​qì tōng​guò xián de zhèn​dòng ér fā​yīn.

   This instrument produces sound through the vibration of its strings.

   Source: Dong Chinese Dictionary

5. 勾三股四弦五。

   gōu sān gǔ sì xián wǔ.

   In a right triangle, the legs are 3 and 4, and the hypotenuse is 5.

   Source: Dong Chinese Dictionary

6. 勾股定理中的“弦”指的就是直角三角形的斜边。

   gōu gǔ dìng​lǐ zhōng de“ xián” zhǐ de jiù shì zhí​jiǎo sān​jiǎo​xíng de xié biān.

   The 'xian' in the Pythagorean theorem refers to the hypotenuse of a right triangle.

   Source: Dong Chinese Dictionary

7. 别忘了给闹钟上弦。

   bié wàng le gěi nào​zhōng shàng xián.

   Don't forget to wind the alarm clock.

   Source: Dong Chinese Dictionary

8. 连接圆上两点的线段称为弦。

   lián​jiē yuán shàng liǎng diǎn de xiàn​duàn chēng​wéi xián.

   A line segment connecting two points on a circle is called a chord.

   Source: Dong Chinese Dictionary