4 sentences

1. 他的病已经到了晚期。

   tā de bìng yǐ​jīng dào le wǎn qī.

   His illness has reached the late stage.

   Source: Dong Chinese Dictionary

2. 蚕在蜕皮之前会停止进食，进入眠期。

   cán zài tuì​pí zhī​qián huì tíng​zhǐ jìn​shí, jìn​rù mián qī.

   Silkworms stop eating and enter a dormant stage before molting.

   Source: Dong Chinese Dictionary

3. 这头母牛正处于分娩期，需要专人照看。

   zhè tóu mǔ​niú zhèng chǔ​yú fēn​miǎn qī, xū​yào zhuān​rén zhào​kàn.

   This cow is about to give birth and needs special care.

   Source: Dong Chinese Dictionary

4. 期年之后，成效显著。

   qī nián zhī​hòu, chéng​xiào xiǎn​zhù.

   After a full year, the results were remarkable.

   Source: Dong Chinese Dictionary