4 sentences

1. 他以此为柄，大肆攻击对方。

   tā yǐ cǐ wéi bǐng, dà​sì gōng​jī duì​fāng.

   He used this as leverage to launch a fierce attack on the opponent.

   Source: Dong Chinese Dictionary

2. 以此为准。

   yǐ cǐ wéi zhǔn.

   Take this as the standard.

   Source: Dong Chinese Dictionary

3. 我们要以此为则，规范自己的日常行为。

   wǒ​men yào yǐ cǐ wéi zé, guī​fàn zì​jǐ de rì​cháng xíng​wéi.

   We should take this as a rule to regulate our daily behavior.

   Source: Dong Chinese Dictionary

4. 我们可以以此为例，讨论具体的改进方案。

   wǒ​men kě​yǐ yǐ cǐ wéi lì, tǎo​lùn jù​tǐ de gǎi​jìn fāng'àn.

   We can take this as an example to discuss specific improvement plans.

   Source: Dong Chinese Dictionary