Cambodia and Thailand exchanged fire on Thursday, killing at least 12 people, after months of rising tension over the shared border between the two Southeast Asian countries. 周四，柬埔寨与泰国发生交火，造成至少12人死亡。此前数月，这两个东南亚国家围绕着共同边界问题，紧张局势不断升级。 The border tensions have…