In Washington, a Defense Department Committee says American commanders in the Middle East are not doing enough to protect their forces. The committee is investigating the bombing of the Navy ship USS Cole in Yemen in October. New measures(1) were put in place after the bombing of American Airforce housing(2) in Saudi Arabia more than 4 years ago. But defense officials say major security(3) problems have remained(4) for American forces in the Middle East.

听音瓶颈词汇