Meaning of tàn:
探
to explore; to search out; to scout; to visit; to stretch forward
Wǒmen juédìng qù shān lǐ tàxiǎn.
我们决定去山里探险。
We decided to explore the mountains.
Tā xǐhuān dào shēnshān lǐ qù tàn xiǎn.
他喜欢到深山里去探险。
He likes to go exploring in the deep mountains.
Xiǎo Wáng bèi pài qù tànchá dírén de dòngxiàng.
小王被派去探查敌人的动向。
Xiao Wang was sent to scout out the enemy's movements.
Tā jìhuà míngtiān qù tànwàng lǎo péngyǒu.
他计划明天去探望老朋友。
He plans to visit an old friend tomorrow.
Tā xiǎoxīn yìyì de tàn chū tóu lái, kàn kàn wàimiàn de qíngkuàng.
他小心翼翼地探出头来,看看外面的情况。
He cautiously stretched his head forward to see what was happening outside.