trip wire
参考词典中trip wire的常规释义：
基本释义
- n. 绊网,地雷拉发线
英英解释
2个名词解释
- a small military force that serves as a first line of defense; if they become engaged in hostilities it will trigger the intervention of stronger military forces
- a wire stretched close to the ground that activates something (a trap or camera or weapon) when tripped over
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