由于 + Cause, Result Clause
由于 (yóuyú) is a preposition meaning "due to," "owing to," or "because of," used to introduce a cause or reason. It typically appears at the beginning of a sentence or clause, followed by the causal factor. It is more formal than 因为 and is common in written Chinese and news reports.
由于天气原因,航班取消了。
yóuyú tiānqì yuányīn, hángbān qǔxiāo le.
The flight was canceled due to weather.
由于工作太忙,他很少有时间陪家人。
yóuyú gōngzuò tài máng, tā hěn shǎo yǒu shíjiān péi jiārén.
Because he's too busy with work, he rarely has time to spend with his family.
由于交通拥堵,我们迟到了半小时。
yóuyú jiāotōng yōngdǔ, wǒmen chídào le bàn xiǎoshí.
Due to traffic congestion, we were half an hour late.