词组、短语、俚语及习惯用语• head above water
(考试)能及格,(生意等)能维持。• head amplifier
前置放大器,前级视频放大器。微音器[话筒]放大器。• head and ears
全身,完全。• head and front
主要部分。• head and heel pickup
握颈踝提起。• head and shoulders above
远远超出。• head and slippage cross
十字头与滑程。• head azimuth
磁头方位角。• head back
回去。• head bay
[水]上闸首。上游池。