def parse_source(sentence_group):
    if ('source' not in sentence_group):
        return '牛津高阶英汉双解词典'
    else:
        return sourceDict[sentence_group['source']]
def parse_source(sentence_group):
    if ('source' not in sentence_group):
        return '牛津高阶英汉双解词典'
    else:
        return sourceDict[sentence_group['source']]