class Sentence(object):

    WORD_TOKENIZER = MyPottsTokenizer(preserve_case=False)

    LEMMATIZER = WordNetLemmatizer()

    # 针对于每一句话抽取aspects
    ASP_EXTRACTOR =

    def __init__(self):


    def word_tokenize(self):
        pass


    def pos_tag(self):
        pass


    def lemmatize(self):
        pass


    def contain_aspect(self):
        pass