目的重症肌无力合并低t 3综合征的主要原因分析。
Objective To analyze the main causes of myasthenia gravis (MG) accompanying low T3 syndrome.
目的：探讨产后大出血的治疗及产后大出血需手术的主要原因分析。
Objective: to investigate the treatment of postpartum hemorrhage and causes that led to surgical treatment.
分析师说，墨西哥经济急剧下滑的主要原因是墨西哥经济与美国紧密相连，美国目前正陷入19世纪30年代以来最严重的经济衰退。
Analysts say the main cause of Mexico's nosedive is that the nation's economy is tied strongly to that of the United States, which is mired in the deepest economic downturn since the 1930s.
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