4 sentences

1. 这一壮举将被载入史册。

   zhè yī zhuàng​jǔ jiāng bèi zǎi​rù shǐ​cè.

   This heroic feat will be recorded in history.

   Source: Dong Chinese Dictionary

2. 他完成了单人横跨大洋的壮举。

   tā wán​chéng le dān​rén héng​kuà dà​yáng de zhuàng​jǔ.

   He completed the feat of crossing the ocean solo.

   Source: Dong Chinese Dictionary

3. 郑和下西洋是中国航海史上的壮举。

   Zhèng Hé xià Xī​yáng shì Zhōng​guó háng​hǎi​shǐ shàng de zhuàng​jǔ.

   Zheng He's voyages to the Western Oceans were a great feat in Chinese maritime history.

   Source: Dong Chinese Dictionary

4. 阿波罗计划是人类航天史上的一大壮举。

   ā​bō​luó jì​huà shì rén​lèi háng​tiān​shǐ shàng de yī dà zhuàng​jǔ.

   The Apollo program was a great feat in the history of human spaceflight.

   Source: Dong Chinese Dictionary