3 sentences

1. 日益衰弱意味着她愈来愈需要卧床。

   rì​yì shuāi​ruò yì​wèi​zhe tā yù​lái​yù xū​yào wò chuáng.

   Increasing frailty meant that she was more and more confined to bed.

   Source: UM-Corpus: Education

2. 衰老的后果之一是你的肌肉逐渐衰弱。

   shuāi​lǎo de hòu​guǒ zhī​yī shì nǐ de jī​ròu zhú​jiàn shuāi​ruò.

   One of the consequences of aging is that your muscles gradually weaken.

   Source: CCMatrix

3. 那是我第一次感觉到母亲身体已经开始衰弱了。

   nà​shì wǒ dì​yī​cì gǎn​jué dào mǔ​qīn shēn​tǐ yǐ​jing kāi​shǐ shuāi​ruò le.

   That was the first time I felt that my mother’s body had begun to weaken.

   Source: CCMatrix