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(1) A ship attempting to overtake another ship shall, in accordance with the provisions of Article 9, paragraph 5 (a), express its intention by whistling the following:史蒂夫·卡瑞尔与史蒂夫·布西密的两位魔术师搭档在拉斯维加斯叱咤多年，如今时代流转，他俩过气的表演风格已很难吸引观众，而此时由金·凯瑞饰演的新晋魔术师以各种炫目狂野无下限的新奇表演日渐蹿红，这让两位“史蒂夫”心生妒意，彼此间的关系也开始紧张起来。从预告来看，史蒂夫·卡瑞尔与金·凯瑞两大喜剧天王将自己的看家本领尽数使出，前者囧囧的冷幽默与后者极尽恶搞的癫狂秀对比强烈，而老戏骨艾伦·阿金饰演的魔术宗师令人眼前一亮，片尾抖出的包袱萌感十足。　　回到2008Javascript neither supports abstract classes nor has the concept of interfaces. Therefore, be very careful when using the state mode. If you forget to implement the buttonWasPressed method for a state subclass when writing a state subclass, an exception will be thrown when the state switches. Because Context always delegates requests to the buttonWasPressed method of the state object. Therefore, let the abstract method of the abstract parent class throw an exception directly, which will be found at least during the program run.