为此

wèi cǐ zuò chū zhǒng zhǒng nǔ lì

为此作出种种努力

make every effort to that end

wèi cǐ wǒ bù xiāng xìn tā le

为此我不相信她了。

For that reason, I don't believe her now.

dà jiā dōu wèi cǐ gǎn dào hěn gāo xìng

大家都为此感到很高兴。

We all feel very delighted by this.

nǐ bù xū yào wèi cǐ wú shì zì rǎo

你不需要为此无事自扰。

You need not make so much ado about it.

zhè xiàng guī zé shì wèi cǐ ér tè yì shè zhì de

这项规则是为此而特意设置的。

The rule was introduced expressly for this purpose.