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There are many different reasons to cause such phenomenon.ï¼æå¾å¤ä¼é æè¿ç§ç°è±¡çä¸ååå ï¼
There are many different reasons causing such phenomenon.ï¼æå¾å¤ç»å¸¸é æè¿ç§ç°è±¡çä¸ååå ï¼
There are many different reasons which have caused such phenomenon.ï¼æå¾å¤å·²ç»é æè¿ç§ç°è±¡çä¸ååå ï¼
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