Usage note
“由此”表示从某个原因或情况出发，引出结果或结论。
“Yóu cǐ” biǎoshì cóng mǒu gè yuányīn huò qíngkuàng chūfā, yǐn chū jiéguǒ huò jiélùn.
"Thereby" indicates starting from a certain reason or situation, leading to a result or conclusion.
Context note
这个词常用于书面语，连接前后逻辑。
Zhège cí chángyòng yú shūmiànyǔ, liánjiē qiánhòu luójí.
This word is often used in written language to connect logic.
5 examples
他努力学习，由此取得了好成绩。
tā nǔ lì xué xí， yóu cǐ qǔ dé le hǎo chéng jì。
He studied hard, thereby achieving good grades.
天气变暖，由此花儿都开了。
tiān qì biàn nuǎn， yóu cǐ huā ér dōu kāi le。
The weather became warm, thereby the flowers all bloomed.
她帮助了别人，由此交到了新朋友。
tā bāng zhù le bié rén， yóu cǐ jiāo dào le xīn péng yǒu。
She helped others, thereby making new friends.
我们节约用水，由此保护了环境。
wǒ men jié yuē yòng shuǐ， yóu cǐ bǎo hù le huán jìng。
We save water, thereby protecting the environment.
他每天锻炼，由此身体变得更强壮。
tā měi tiān duàn liàn， yóu cǐ shēn tǐ biàn de gèng qiáng zhuàng。
He exercises every day, thereby becoming stronger.
5 mini stories
小华每天读书，由此学到了很多知识。他喜欢和同学分享。
xiǎo huá měi tiān dú shū， yóu cǐ xué dào le hěn duō zhī shi。 tā xǐ huan hé tóng xué fēn xiǎng。
Xiao Hua reads every day, thereby learning a lot of knowledge. He likes to share with classmates.
公园里种了很多树，由此空气变得清新。大家常去散步。
gōng yuán lǐ zhǒng le hěn duō shù， yóu cǐ kōng qì biàn de qīng xīn。 dà jiā cháng qù sàn bù。
Many trees were planted in the park, thereby the air became fresh. Everyone often goes for walks.
老师耐心教导，由此学生们进步很快。他们都很感激。
lǎo shī nài xīn jiào dǎo， yóu cǐ xué shēng men jìn bù hěn kuài。 tā men dōu hěn gǎn jī。
The teacher patiently taught, thereby the students improved quickly. They are all grateful.
小丽坚持练琴，由此钢琴弹得越来越好。她参加了比赛。
xiǎo lì jiān chí liàn qín， yóu cǐ gāng qín tán dé yuè lái yuè hǎo。 tā cān jiā le bǐ sài。
Xiao Li persisted in practicing piano, thereby playing better and better. She participated in a competition.
大家互相帮助，由此班级更加团结。他们一起完成了任务。
dà jiā hù xiāng bāng zhù， yóu cǐ bān jí gèng jiā tuán jié。 tā men yì qǐ wán chéng le rèn wu。
Everyone helped each other, thereby the class became more united. They completed the task together.
Mini dialogue
由此开始
A
我们从这里出发，由此上山。
Wǒmen cóng zhèlǐ chūfā, yóu cǐ shàng shān.
We start from here, and go up the mountain from here.
B
好的，由此路走比较近。
Hǎo de, yóu cǐ lù zǒu bǐjiào jìn.
Okay, going this way is closer.
由此得知
A
他努力学习，由此取得了好成绩。
Tā nǔlì xuéxí, yóu cǐ qǔdé le hǎo chéngjì.
He studied hard, thereby achieving good grades.
B
由此看来，努力很重要。
Yóu cǐ kàn lái, nǔlì hěn zhòngyào.
From this, it seems that hard work is important.
Related words and contrasts
similar
因此
yīn cǐ
therefore
由此 and 因此 both mean 'therefore', but 由此 is more formal.
similar
所以
suǒ yǐ
so
所以 is the most common way to say 'so' or 'therefore'.
similar
于是
yú shì
hence
于是 is used to show a natural result, often in stories.