Unexplained trend maybe due to warming , natural cycles , expert says .
专家认为，这个暂无法解释的趋势可能与气候变暖和自然环流有关。
Get treatment at the first sign of unexplained rash .
一旦有长出不明疹子的迹象时就着手治疗。
Both can have various symptoms , but persistent , unexplained exhaustion is a main one .
这两种病都有许多症状，但主要是持续时间上，有莫名的疲劳感。
The french authorities say they fear a serial killer may be behind a series of unexplained shootings in a suburb of paris .
法国当局称，他们担心在巴黎郊区神秘枪击案的背后，是一名连环杀手在作案。
Psychic powers and extra-sensory perception ( esp ) rank among the top ten unexplained phenomena if for no other reason than that belief in them is so widespread .
