3 sentences

1. 水在摄氏零度时结冰。

   shuǐ zài shè​shì líng​dù shí jié bīng.

   Water freezes at zero degrees Celsius.

   Source: Tatoeba

2. 温度计显示气温是零下7摄氏度。

   wēn​dù​jì xiǎn​shì qì​wēn shì líng​xià7 shè​shì​dù.

   The thermometer shows that the temperature is minus 7 degrees Celsius.

   Source: CCMatrix

3. 这里冬天的温度是27摄氏度，水温是20摄氏度。

   zhè​lǐ dōng​tiān de wēn​dù shì27 shè​shì​dù, shuǐ​wēn shì20 shè​shì​dù.

   In winter, the temperature here is 27 degrees Celsius, and the water temperature is 20 degrees Celsius.

   Source: CCMatrix