a small but essential part of a large system
大型系统中的一个小而重要的部分 (dàxíng xìtǒng zhōng de yīgè xiǎo ér zhòngyào de bùfen)
"Every engineer is a cog in the machine that keeps the factory running."
"每个工程师都是机器中的一颗齿轮，帮助工厂运转。" (Měi gè gōngchéngshī dōu shì **jīqì zhōng de yī kē chǐlún**, bāngzhù gōngchǎng yùnzhuǎn.)
to become very angry or emotional suddenly
Consistency and patience lead to success.
to smile broadly because of happiness
to start a journey; to leave a place
to wash something quickly with water
extremely thankful
