n.大头钉( tack的名词复数 )；平头钉；航向；方法v.用平头钉钉( tack的第三人称单数 )；附加，增补；帆船抢风行驶，用粗线脚缝； 双语释义：v.(动词)vt. 固定 fasten with small flat-headed nails; attachvt. 粗缝,假缝 fasten with long, loose stitches; baste英英释义： tackn.the heading or position of a vessel relative to the trim of it