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本期内容：
David Cameron set out the case for Britain to join America, France and others in air strikes against Islamic state（伊斯兰国） in Syria. Britain was already a“top-tier” target of IS, he said, and could not “subcontract” its security to its allies. A parliamentary vote is expected next week,if the prime minister is sure of a majority.
词义解析:
set out：陈述
air strike: 空袭
top-tier: 首要的
subcontract：转包
