Comparative of sour: more acidic in taste or smell

• More unfriendly or resentful in attitude
• Of sound: more off-pitch or harsh
• Of soil: more acidic and less fertile
• Of petroleum: containing more sulfur compounds
• More unfavorable or adverse

sour 的比较级：更酸的

• 味道或气味更酸
• 态度更不友好或更怨恨
• 指声音：更走调或更刺耳
• 指土壤：酸性更强、肥力更低
• 指石油：含硫量更高
• 更加不利或不幸

Something that makes another thing sour

• A fermenting agent or acidifier

使某物变酸的东西

• 发酵剂或酸化剂