3 sentences

1. 我有乳糖不耐症啊。

   wǒ yǒu rǔ​táng​bù​nài​zhèng a.

   I'm lactose intolerant.

   Source: OpenSubtitles

2. 乳糖不耐症是非常普遍的。

   rǔ​táng​bù​nài​zhèng shì fēi​cháng pǔ​biàn de.

   Lactose intolerance is very common.

   Source: CCMatrix

3. 乳糖不耐症和牛奶过敏不是一回事。

   rǔ​táng​bù​nài​zhèng hé niú​nǎi guò​mǐn bù​shì yī​huí​shì.

   Lactose intolerance and milk allergy are not the same thing.

   Source: CCMatrix