3 sentences

1. 法官将保证金定为五万元。

   fǎ​guān jiāng bǎo​zhèng​jīn dìng wéi wǔ​wàn yuán.

   The judge set the bail at 50,000 yuan.

   Source: Dong Chinese Dictionary

2. 租房时，租客通常需要支付一个月的保证金。

   zū fáng shí, zū​kè tōng​cháng xū​yào zhī​fù yī gè yuè de bǎo​zhèng​jīn.

   When renting a house, tenants usually need to pay a one-month security deposit.

   Source: Dong Chinese Dictionary

3. 如果账户资金低于维持保证金，你将收到追缴通知。

   rú​guǒ zhàng​hù zī​jīn dī​yú wéi​chí bǎo​zhèng​jīn, nǐ jiāng shōu​dào zhuī​jiǎo tōng​zhī.

   If the account funds fall below the maintenance margin, you will receive a margin call.

   Source: Dong Chinese Dictionary