木卫二的地下海洋缺乏光线，但这没有排除生命形成的可能性。
The lack of light in Europa's subsurface ocean doesn't automatically rule out life forming.
许多水上摩托车驾驶员缺乏经验，且对航行规则一无所知，这增加了发生事故的可能性。
Many water scooter operators are inexperienced and ignorant of navigational rules, which increase the potential for accidents.
许多水上摩托车驾驶员缺乏经验，且对航行规则一无所知，这增加了发生事故的可能性。
Many water scooter operators are inexperienced and ignorant of navigational rules, which increase the potential for accidents.
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