4 sentences

1. 拓先生是这方面的专家。

   Tuò xiān​sheng shì zhè fāng​miàn de zhuān​jiā.

   Mr. Tuo is an expert in this field.

   Source: Dong Chinese Dictionary

2. 他在石碑上拓下了一份碑文。

   tā zài shí​bēi shàng tà xià le yī fèn bēi​wén.

   He made a rubbing of an inscription from the stone tablet.

   Source: Dong Chinese Dictionary

3. 他在那片荒山上拓出了几亩新田。

   tā zài nà piàn huāng​shān shàng tuò chū le jǐ mǔ xīn tián.

   He reclaimed several acres of new fields on that barren hill.

   Source: Dong Chinese Dictionary

4. “拓”是一个多音字，在古代有推的意思。

   “ tuò” shì yī gè duō​yīn​zì, zài gǔ​dài yǒu tuī de yì​si.

   The character '拓' is a polyphone; in ancient times, it meant 'to push'.

   Source: Dong Chinese Dictionary