Last year, Russia claimed that the Buk missile came from the Ukrainian army.

去年，俄罗斯声称Buk导弹来自乌克兰军队。

The Netherlands and Australia have said they hold Moscow responsible for providing the Buk missile system used in the attack.

荷兰和澳大利亚表示，他们认为，俄罗斯政府应对袭击中使用的Buk导弹系统承担责任。

U.S. officials refuse to say definitively who pulled the trigger, but they believe the weapon system behind the tragedy is a Buk, a Russian-made mobile surface-to-air missile system.

美国官方拒绝明确指出幕后黑手，但他们认为造成这场惨案的武器系统是俄罗斯产的移动地对空导弹系统“山毛榉”。

The team also said the four prepared the launch of the Buk missile that brought the plane down, although they may not have made the decision to actually launch the missile.

该小组还表示，4名嫌疑人筹备了击落飞机的Buk导弹发射计划，虽然实际发射导弹的决定可能不是他们做出的。

Last year, the team said that it was sure that the Buk missile that hit flight MH17 came from the Russian army's 53rd Anti-Aircraft Missile brigade in the Russian city of Kursk.

去年，该团队表示，可以肯定，击中MH17航班的Buk导弹来自俄罗斯军队在库尔斯克市的第53防空导弹旅。