The noun 引擎 (yǐnqíng) means "engine" and can refer to both mechanical engines and metaphorical engines of growth or technology, such as search engines (搜索引擎). It is a loanword-influenced term widely used in technology and automotive contexts.
这辆车的引擎声音很大,可能需要修理了。
Zhè liàng chē de yǐnqíng shēngyīn hěn dà, kěnéng xūyào xiūlǐ le.
This car's engine is very loud — it probably needs to be repaired.
你平时用什么搜索引擎查资料?
Nǐ píngshí yòng shénme sōusuǒ yǐnqíng chá zīliào?
What search engine do you usually use to look up information?
科技创新是经济发展的重要引擎。
Kējì chuàngxīn shì jīngjì fāzhǎn de zhòngyào yǐnqíng.
Technological innovation is an important engine for economic development.