The Navy plans to purchase 117 P-8A anti-submarine warfare, anti-surface warfare, intelligence, surveillance and reconnaissance aircraft to replace its P-3 fleet.

海军计划采购117架P - 8 A反潜战、反水面战、情报、监视和侦查战机，以替代p - 3机群，并将于2013年形成初期作战能力。

youdao

There were several versions of the R4D, this particular aircraft was one of only 30 configured as one of the more interesting variants, the R4D-6S, which was used for anti-submarine warfare.

有好几个版本的R4D ，这架飞机是特别的一个只有30设定为一个比较有趣的变种，该R4D - 6S ，这是用于反潜作战。

youdao

Additionally, an unspecified number of aircraft, designed for anti-submarine warfare, will be stationed temporarily at a Venezuelan air base.

ECONOMIST: Ruling the waves