5 sentences

1. 他已经步入中年了。

   tā yǐ​jīng bù​rù zhōng​nián le.

   He has already entered middle age.

   Source: Dong Chinese Dictionary

2. 我们的计划已经步入正轨。

   wǒ​men de jì​huà yǐ​jīng bù​rù zhèng​guǐ.

   Our plan is already on the right track.

   Source: Dong Chinese Dictionary

3. 中国已经步入了老龄化社会。

   Zhōng​guó yǐ​jīng bù​rù le lǎo​líng​huà shè​huì.

   China has entered an aging society.

   Source: Dong Chinese Dictionary

4. 他毕生都在追求步入艺术的殿堂。

   tā bì​shēng dōu zài zhuī​qiú bù​rù yì​shù de diàn​táng.

   He has spent his whole life pursuing entry into the temple of art.

   Source: Dong Chinese Dictionary

5. 他缓缓步入礼堂。

   tā huǎn​huǎn bù​rù lǐ​táng.

   He slowly walked into the auditorium.

   Source: Dong Chinese Dictionary