3 sentences for 约定 (yuē​dìng — stipulated)

1. 请在约定的时间内提交报告。

   qǐng zài yuē​dìng de shí​jiān nèi tí​jiāo bào​gào.

   Please submit the report within the agreed time.

   Source: Dong Chinese Dictionary

2. 地下党员在约定的地点接头。

   dì​xià dǎng​yuán zài yuē​dìng de dì​diǎn jiē​tóu.

   The underground party members met at the rendezvous point.

   Source: Dong Chinese Dictionary

3. 投保人应当按照合同约定按时缴纳保险费。

   tóu​bǎo​rén yīng​dāng àn​zhào hé​tong yuē​dìng àn​shí jiǎo​nà bǎo​xiǎn​fèi.

   The policyholder should pay the insurance premiums on time as agreed in the contract.

   Source: Dong Chinese Dictionary