The bureau said that China is witnessing rapid increases in international exchanges and the number of people entering or exiting the country each year. "Meanwhile, overseas espionage agencies(间谍机构)and other unfriendly forces have also strengthened their disruptive(破坏的) activities in China, including political, economical and military information." it said.

　　Some Chinese individuals have also betrayed the nation to benefit their private interests, which offers overseas espionage agencies opportunities, the bureau said, adding that Beijing is the primary location for such activities. Therefore, it's necessary to take new measures in anti-espionage investigation, and to encourage the participation of the general public.

　　One of the most recent cases made public occurred in the eastern province of Jiangsu in January. Two residents in Lianyungang city, surnamed Zhang and Wan, called the national security authorities after they found a device with instructions in foreign languages while fishing in the Yellow Sea. The device was later found to be spying equipment made and used by overseas agencies to collect data, according to an official release.

　　China has strengthened Iegislation(立法) on State security in recent years. Facing a more complex State security situation, in 2017, the Standing Committee of the National People's Congress adopted the Counterespionage Law.

　　28．From the passage, we can learn that ________.

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