undetermined cause
原因未确定疾病 Diseases of uncertain etiology
·2,447,543篇论文数据，部分数据来源于NoteExpress
消息称原定于20日上线的“京东团购”频道因后台系统不完善等原因，将推迟上线，新上线时间未定。
News that was scheduled on the line 20 "Jingdong buy" back-channel systems are imperfect because of other reasons, will be delayed on the line, the new on-line time to be determined.
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