The room smelled of lemons.

房间有股柠檬的气味。

Citric acid can be extracted from the juice of oranges, lemons, limes or grapefruit.

柠檬酸可以从橙汁、柠檬汁、酸橙汁或柚子汁中提取。

Do you like lemons or oranges?

你喜欢柠檬还是桔子？

Do lemons grow on the ground?

柠檬是长在地上的吗？

Lemons are a kind of sour fruit.

柠檬是一种酸的水果。