8 sentences

1. 演员们正在后台化舞台妆。

   yǎn​yuán men zhèng​zài hòu​tái huà wǔ tái zhuāng.

   The actors are backstage putting on their stage makeup.

   Source: Dong Chinese Dictionary

2. 演员们正在后台穿戴行头。

   yǎn​yuán men zhèng​zài hòu​tái chuān​dài xíng​tou.

   The actors are putting on their costumes and gear backstage.

   Source: Dong Chinese Dictionary

3. 演员们正在后台准备上场。

   yǎn​yuán men zhèng​zài hòu​tái zhǔn​bèi shàng​chǎng.

   The actors are backstage preparing to go on.

   Source: Dong Chinese Dictionary

4. 演员们正在后台为接下来的演出化装。

   yǎn​yuán men zhèng​zài hòu​tái wèi jiē​xià​lái de yǎn​chū huà​zhuāng.

   The actors are backstage putting on their stage makeup for the next performance.

   Source: Dong Chinese Dictionary

5. 这位演员在后台整理表演时需要的各种末。

   zhè wèi yǎn​yuán zài hòu​tái zhěng​lǐ biǎo​yǎn shí xū​yào de gè zhǒng mò.

   The actor is backstage sorting out the various powders needed for the performance.

   Source: Dong Chinese Dictionary

6. 他穿上一套西装，假装成工作人员混进了后台。

   tā chuān​shang yī tào xī​zhuāng, jiǎ​zhuāng chéng gōng​zuò​rén​yuán hùn​jìn le hòu​tái.

   He put on a suit and managed to sneak backstage by pretending to be a staff member.

   Source: Dong Chinese Dictionary

7. 管理员可以登录后台修改网站内容。

   guǎn​lǐ​yuán kě​yǐ dēng​lù hòu​tái xiū​gǎi wǎng​zhàn nèi​róng.

   The administrator can log into the backend to modify website content.

   Source: Dong Chinese Dictionary

8. 如果没有强大的后台，他不可能拿到这个项目。

   rú​guǒ méi​yǒu qiáng​dà de hòu​tái, tā bù kě​néng ná​dào zhè​ge xiàng​mù.

   Without powerful backing, it would have been impossible for him to get this project.

   Source: Dong Chinese Dictionary