慢速英语:NATO to Russia: Withdraw from Ukraine

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1. He called for the withdrawal of Russian troops and Russia's support for separatists in eastern Ukraine.

call for 需要
例句：Different circumstances call for different tactics. 
不同的情势需要不同的策略。 

2. The NATO chief said, "We call on Russia to pull back its troops from Ukraine and to stop the flow of arms, fighters and funds to the separatists."

pull back （使）（某人，尤指一组士兵）撤出阵地
例句：The enemy were forced to pull back. 
敌军被迫退却。 

3. The investigation will look into accusations that Ferguson police have treated African-Americans unfairly.

look into 在…里查资料; 深入地检查; 调查; 观察
例句：He has promised to look into the matter. 
他已经答应对这个问题进行调查。