Meaning of yóu:
由
to follow
Tā de yīqiè xíngwéi dōu yóu yuánzé zhǐdǎo.
他的一切行为都由原则指导。
All his actions are guided by principles.
from; because of; due to; by; via; through; (before a noun and a verb) it is for ... to ...
Tā cóng xiǎo yóu wàipó fǔyǎng zhǎngdà.
他从小由外婆抚养长大。
He was raised by his grandmother from a young age.
Tā yóu yú shēng bìng, wú fǎ cān jiā jù huì.
他由于生病,无法参加聚会。
He cannot attend the party because of illness.
Zhè fú huà shì yóu yī gè zhù míng de yì shù jiā chuàng zuò de.
这幅画是由一个着名的艺术家创作的。
This painting was created by a famous artist.
Zhè jiàn shì yóu nǐ lái juédìng.
这件事由你来决定。
It is for you to decide this matter.