3 sentences

1. 一杯冷水在暑热的天气里十分提神。

   yī bēi lěng​shuǐ zài shǔ​rè de tiān​qì li shí​fēn tí shén.

   A glass of cold water is very refreshing in hot weather.

   Source: Tatoeba

2. 如果你想梳洗一番提神，但是没有时间洗澡，那就试着洗脸。

   rú​guǒ nǐ xiǎng shū xǐ yī​fān tí shén, dàn​shì méi​yǒu shí​jiān xǐ zǎo, nà jiù shì zhe xǐ liǎn.

   If you want to freshen up but don’t have time for a shower, try washing your face.

   Source: CCMatrix

3. 咖啡有提神醒脑的效果，因为其中含有咖啡因。

   kā​fēi yǒu tí​shén​xǐng​nǎo de xiào​guǒ, yīn​wèi qí​zhōng hán​yǒu kā​fēi​yīn.

   Coffee has a refreshing effect because it contains caffeine.

   Source: CCMatrix