Withdrawal-infusion n pump 抽缩式输液泵
Since Ethiopia's withdrawal in January, al-Shabab began cooperating with another Islamist group called Hisbul Islam to topple the U.N.-backed, but weak transitional federal government, and to force more than 5,000 AU peacekeepers from Uganda and Burundi to abandon their mission.
VOA: standard.2009.08.21
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