5 sentences

1. 她在帮我钉掉落的纽扣。

   tā zài bāng wǒ dìng diào​luò de niǔ​kòu.

   She is helping me sew on a button that fell off.

   Source: Dong Chinese Dictionary

2. 他在地毯上找一根掉落的针。

   tā zài dì​tǎn shàng zhǎo yī gēn diào​luò de zhēn.

   He is looking for a dropped needle on the carpet.

   Source: Dong Chinese Dictionary

3. 锯木头的时候掉落了很多木屑。

   jù mù​tou de shí​hou diào​luò le hěn​duō mù xiè.

   A lot of sawdust fell off while sawing the wood.

   Source: Dong Chinese Dictionary

4. 老师帮那个小女孩缝好了外套上掉落的钮扣。

   lǎo​shī bāng nà gè xiǎo nǚ​hái féng​hǎo le wài​tào shàng diào​luò de niǔ kòu.

   The teacher helped the little girl sew back the button that had fallen off her coat.

   Source: Dong Chinese Dictionary

5. 一颗螺丝钉从机器上掉落，导致整台设备停工。

   yī kē luó​sī​dīng cóng jī​qì shàng diào​luò, dǎo​zhì zhěng tái shè​bèi tíng​gōng.

   A screw fell out of the machine, causing the entire device to stop working.

   Source: Dong Chinese Dictionary