trun·nion /ˈtrʌnjən/
 炮耳,空樞,耳軸


 Trun·nion n.
 1. Gun. A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. See Illust. of Cannon.
 2. Steam Engine A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam.
 Trunnion plate Gun., a plate in the carriage of a gun, mortar, or howitzer, which covers the upper part of the cheek, and forms a bearing under the trunnion.
 Trunnion ring Gun., a ring on a cannon next before the trunnions. [R.]

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