...用动力公司正在按照2004年11月签订的合同为美国海军陆战队牵头研制代号为远征火力支援系统（Expeditionary Fire Support System，EFSS）的120毫米线膛迫击炮。
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expeditionary fire support system
远征火力支援系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The ITV is also an important component of the Expeditionary Fire Support System, which allows a mobile mortar system to provide long-range indirect fire support to infantry forces as part of the Marine Corps' "Ship to Objective Maneuver" doctrine.
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