Large numbers of security police stood by.
许多秘密警察站在旁边。
One of the documents leaked to the press was a memorandum written by the head of the security police.
透露给报界的文件中有一份是秘密警察局长写的备忘录。
There are at least 200, 000 official participants, plus thousands of security police.
正式参加国庆活动的人员将超过20万人,另外还有数千名安保警察。