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　　“有一天，一个男孩儿看着大海，问我：什么是海洋？什么是海洋？”这就是影片的开篇语。《海洋》拷问人类影响海底生命留下的痕迹。这不是一部资料片，而是一部纪实电影，是事实。整部影片没有人为视角，没有评论，只让镜头说话。雅克·贝汉与雅克·克鲁佐（Jacques Cluzaud）希望通过影片促进人们对濒危海洋世界的保护，并介绍部分濒临消亡的海洋生物。哪里？公子是有福一人，上天保佑。What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.一个个苦眉愁脸的，干什么？这时，网站总编王治乾走出来，说道：其他人对启明不看好，你们也不看好？然后不等有人回答，王治乾就说道：老板已经和我说了，他的新小说已经准备得差不多了，很快就能发布。MTV已续订《少狼》第六季。Why would they do that?Use reasonable data sampling: It is necessary to ensure that a small number of entities (including IP or users) cannot account for most of the model training data. In particular, care should be taken not to pay too much attention to false positives and false negatives reported by users. This may be achieved by limiting the number of examples that each user can contribute or using attenuation weights based on the number of reported examples.