Contacts with foreigners are an especially sensitive area; the flood of foreign students, businessmen, diplomats and tourists in recent years has made the authorities increasingly nervous about the "pollution" these visitors may bring.
由於過去幾年來，有大量外國學生、商人、外交人員和觀光客獲准進入中國大陸，有很多跡象顯示，共黨愈來愈擔心外國人的「汙染」。