4 sentences

1. 他辞去了公职，选择下海从商。

   tā cí​qù le gōng​zhí, xuǎn​zé xià​hǎi cóng shāng.

   He resigned from his public office to go into business.

   Source: Dong Chinese Dictionary

2. 他放弃了铁饭碗，决定下海经商。

   tā fàng​qì le tiě fàn​wǎn, jué​dìng xià​hǎi jīng​shāng.

   He gave up his secure government job and decided to go into business.

   Source: Dong Chinese Dictionary

3. 今天风浪太大，所有的渔船都不能下海。

   jīn​tiān fēng​làng tài dà, suǒ​yǒu de yú​chuán dōu bù néng xià​hǎi.

   The waves are too big today, so no fishing boats can go out to sea.

   Source: Dong Chinese Dictionary

4. 在那个动荡的年代，不少女性被迫下海谋生。

   zài nà gè dòng​dàng de nián​dài, bù​shǎo nǚ​xìng bèi​pò xià​hǎi móu​shēng.

   In those turbulent years, many women were forced into prostitution to make a living.

   Source: Dong Chinese Dictionary