4 sentences

1. 他从窗口探出头来。

   tā cóng chuāng​kǒu tàn chū tóu lái.

   He poked his head out of the window.

   Source: Dong Chinese Dictionary

2. 日初出沧沧凉凉，及其日中如探汤。

   rì​chū chū cāng cāng liáng​liáng, jí​qí rì zhōng rú tàn tāng.

   When the sun first rises, it is cool; by midday, it is as hot as boiling water.

   Source: Dong Chinese Dictionary

3. 过年了，他带了一些礼物去探了探几位老邻居。

   guò​nián le, tā dài le yī​xiē lǐ​wù qù tàn le tàn jǐ wèi lǎo lín​jū.

   Since it was the New Year, he brought some gifts to visit a few old neighbors.

   Source: Dong Chinese Dictionary

4. 我打算一个人进那个古老的山洞里探个究竟。

   wǒ dǎ​suàn yī gè rén jìn nà gè gǔ​lǎo de shān​dòng lǐ tàn gè jiū​jìng.

   I plan to go into that ancient cave alone to find out what is inside.

   Source: Dong Chinese Dictionary