?活动船板
... centre zero scale 双边刻度(中心为零) centreboard n. (帆船的)活动船板,中插板 centrecut 中心[锥形]掏槽 ...
中插板吊索
中插板索
中央板套筒
The centreboard problem is largely under control and temporarily repaired, and the crew made a temporary repair to limit the water ingress but they still have been taking water since, and need to maintain a regular routine pumping out.
UNESCO: EDUCATION
centreboard:
centre +? board
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