老师指定他当这次活动的负责人。

Lǎoshī zhǐdìng tā dāng zhè cì huódòng de fùzérén.

The teacher appointed him as the person in charge of this activity.

请在指定的时间内提交报告。

Qǐng zài zhǐdìng de shíjiān nèi tíjiāo bàogào.

Please submit the report within the specified time.

会议地点已经由公司指定好了。

Huìyì dìdiǎn yǐjīng yóu gōngsī zhǐdìng hǎo le.

The meeting place has already been designated by the company.