for entity_pair in entities.split(';'):
    entity_id = entity_pair[:entity_pair.index(':')]
    entity_name = entity_pair[entity_pair.index(':') + 1:]

    # remove non-character word and transform words to lower case
    entity_name = PATTERN1.sub(' ', entity_name)
    entity_name = PATTERN2.sub(' ', entity_name).lower()
    # constructing map: word -> entity_index
    for w in entity_name.split(' '):
        entity_index = entity2index[entity_id]  
        local_map[w] = entity_index  # 这里有问题，不同的实体如果有相同的词，就覆盖了之前的entity_index，不知道这里什么意思？

return local_map