他们停止了在那山区的侦察活动。

They stopped scout in the mountainous area.

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美方飞机在中国近海所从事的并不是一般的飞行，而是收集中国情报的侦察活动。

The U.S. planes are not conducting ordinary flights in the airspace over the waters off China's coast, but are carrying out reconnaissance activities to collect intelligence about the Chinese side.

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最近刚刚退休的一位负责美国空军情报侦察活动的将军，大卫·德普·维拉对此表示同意。

David Deptula, a retired general who was until recently in charge of the US Air Force's intelligence and surveillance operations agrees.

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