This is the 6816th most frequent Chinese word.
洋
"洋" means "ocean" or "foreign."
The word '洋' is used here as an adjective meaning 'Western' to describe the type of fast food offered.
这是一家洋快餐店，供应汉堡和炸鸡。
This is a Western fast-food restaurant, offering hamburgers and fried chicken.
In this sentence, '洋' is an adjective that means 'Western' or 'foreign' to specify clothing styles.
她对洋服的款式特别感兴趣。
She is particularly interested in the styles of Western clothing.
'洋葱' includes '洋', but here it doesn't directly imply 'foreign'; instead, it refers to 'onion' in a compound noun context.