3 sentences

1. 我是一个重度吸烟者。

   wǒ shì yī​ge zhòng​dù xī​yān​zhě.

   I'm a heavy smoker.

   Source: OpenSubtitles

2. 症状可以从轻度到重度，并可能随时间而改变。

   zhèng​zhuàng kě​yǐ cóng qīng​dù dào zhòng​dù, bìng kě​néng suí shí​jiān ér gǎi​biàn.

   Symptoms can range from mild to severe and may change over time.

   Source: CCMatrix

3. 避免气味：重度香味的肥皂和香水可能会吸引蚊子。

   bì​miǎn qì​wèi: zhòng​dù xiāng​wèi de féi​zào hé xiāng​shuǐ kě​néng huì xī​yǐn wén​zi.

   Avoid scents: Heavily scented soaps and perfumes may attract mosquitos.

   Source: CCMatrix