Combined Russian-separatist forces must stop blocking the movements of the OSCE Special Monitoring Mission.

俄方独立派军力必须停止阻碍欧洲安全与合作委员会特别监督组的行动。

OK. An obstacle is an object that is in your way and blocks your movement.

好的。障碍物是挡在路上，阻碍你前进的物体。

Such dams can block fish movements, damage water quality and release methane, a greenhouse gas.

这样的大坝会阻碍鱼类活动，破坏水质，释放温室气体甲烷。

He threatened to have the East Germans block all movement into and out of the Allied-controlled western half of Berlin.

他威胁要封锁东德进出西柏林的一切活动，那时西柏林由盟军控制。

But he also had used a legal move to block the Abolitionist Movement from bringing anti-slavery petitions before Congress. That pleased the South.

但他也利用法律手段阻止废奴运动向国会提交反奴隶制请愿书，而这又让南方人很高兴。

This idea comes from natural observations: Mountains and mountain ranges block the movement of air, forcing it upward.

这个想法来自自然观察：山脉和山脉阻挡空气的运动， 迫使它向上。