So when a French submarine (潜水艇) detected the device's homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed.
出自-2010年6月阅读原文
Homing signals sent by the pilot before the crash
出自-2010年6月阅读原文
They have stopped sending homing signals.
出自-2010年6月阅读原文
柯林斯高阶英汉双解学习词典释义
ADJ
（武器、设备等）自动寻向的，自导引的
A weapon or piece of equipment that has a homing system is able to guide itself to a target or to give out a signal that guides people to it.