souring
['sɑʊərɪŋ]
v.
（使某物）变酸，变馊， （使某人）阴郁( sour的现在分词 );
关系、态度、人等（使）变坏，恶化;
例句:
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Ritter's approval ratings have plummeted amid a souring economy.
来自WSJ
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Researches on the new Zs - Series fibroin protective rapid souring agents.
介绍了ZS系列丝素保护快速精练剂的应用范围和性能,并与国内外常用精练剂作了对比试验.
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Yet the Japanese market for luxury goods was souring.
然而,日本市场对奢侈品的需求逐渐变味了.
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Ditto credit : undeterred by souring quality, banks remain under pressure to lend.
放贷也可能抬头, 银行仍承受着放贷的压力,而并未因贷款质量恶化而收敛.
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A bowl of milk was souring in the sun.
来自H. E. Bates
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Mergers that months ago looked sweet are souring.
来自WSJ