3 sentences

1. 哥德巴赫猜想是一个著名的数学难题。

   Gē​dé​bā​hè cāi​xiǎng shì yī gè zhù​míng de shù​xué nán​tí.

   Goldbach's Conjecture is a famous mathematical problem.

   Source: Dong Chinese Dictionary

2. 数学家正在通过严密的计算来求证这个猜想。

   shù​xué​jiā zhèng​zài tōng​guò yán​mì de jì​suàn lái qiú​zhèng zhè​gè cāi​xiǎng.

   The mathematician is using rigorous calculations to prove this conjecture.

   Source: Dong Chinese Dictionary

3. 我猜想他今天不会来了。

   wǒ cāi​xiǎng tā jīn​tiān bù huì lái le.

   I suspect he won't be coming today.

   Source: Dong Chinese Dictionary