常見例句The mast socket and centreboard location hole of an 8 feet FRP yacht were improved. 本文對8英尺FRP游艇帆桿座及穩(wěn)水板孔的結(jié)構(gòu)進(jìn)行研究改進(jìn),彌補(bǔ)了原有結(jié)構(gòu)的不足。centreboard pennant 中插板索 返回 centreboard