3 sentences

1. 这件事情的变数很大。

   zhè jiàn shì​qing de biàn​shù hěn dà.

   There are many variables involved in this matter.

   Source: Dong Chinese Dictionary

2. 这场比赛的结果还有很多变数。

   zhè chǎng bǐ​sài de jié​guǒ hái yǒu hěn​duō biàn​shù.

   The outcome of this match is still uncertain.

   Source: Dong Chinese Dictionary

3. 这场比赛的结果还有很大变数，谁都可能赢。

   zhè chǎng bǐ​sài de jié​guǒ hái yǒu hěn dà biàn​shù, shéi dōu kě​néng yíng.

   The outcome of this match is still very much up in the air; anyone could win.

   Source: Dong Chinese Dictionary