[a timber (lumber) is as straight as a straightened line made by a carpenter's ink marker] 木材直得合乎拉直的墨線(xiàn)。中,動(dòng)詞,符合、合乎。繩,木匠用以取直,浸滿(mǎn)墨汁的線(xiàn)繩 木直中繩,輮以為輪,其曲中規(guī)。--荀況《勸學(xué)》 木直中繩 (mù zhí zhòng shéng)解釋?zhuān)褐校悍?、合于;繩:木匠用以取直,浸滿(mǎn)墨汁的線(xiàn)繩。木材直得合乎拉直的墨線(xiàn)。