For example, flat files should have a trailerrecord telling the total of records in the file and an aggregate of the key fields.
例如，普通文件应该有一条尾记录，说明文件中的总记录数，以及关键字段的合计。
2
The films trailer was released online in May, only three days after shooting was completed. It has been viewed 4.7 million times, creating a new record among Chinese movies.