This is the 3005th most frequent Chinese word.
联防
Joint defense.
联防 is used here to indicate 'joint defense' undertaken collectively by a group.
社区居民组织了联防小组,共同维护治安。
The community residents organized a joint defense team to maintain public security together.
联防 refers to international collaborative defense in this sentence.
各国之间加强联防合作以应对共同的威胁。
Countries strengthen joint defense cooperation to address common threats.
联防 pertains to the internal organizational defense strategies in this context.