3 sentences

1. 法院撤销了对他的指控。

   fǎ​yuàn chè​xiāo le duì tā de zhǐ​kòng.

   The court dropped the charges against him.

   Source: Dong Chinese Dictionary

2. 由于证据不足，法官撤销了这项指控。

   yóu​yú zhèng​jù bù​zú, fǎ​guān chè​xiāo le zhè xiàng zhǐ​kòng.

   The judge dismissed the charge due to insufficient evidence.

   Source: Dong Chinese Dictionary

3. 你可以按快捷键Ctrl+Z来撤销刚才的操作。

   nǐ kě​yǐ àn kuài​jié​jiànCtrl+Z lái chè​xiāo gāng​cái de cāo​zuò.

   You can press Ctrl+Z to undo your last action.

   Source: Dong Chinese Dictionary