mains hold的相關資料：
臨近單詞
mainsail
mains
mainshaft cutting running rate
mainshaft rear bearing oil seal
mainshock-aftershock sequence
mainshaft low speed sliding gear
mainshaft overdrive gear bushing
mains gas/water/electricity
mainshaft high speed sliding gear
mainshaft synchronizer gear sleeve
mainshaft speed gear retainer ring
mainspring with sliding attachment
