sunk a.凹陷的sink的过去式和过...be sunk in deep thoughts 陷入沉思...sunk or burnt 沉没或焚毁...sunk cost 沉没成本...sunk fence 矮墙...sunk key 沉头键...sunk head rivet 沉头铆钉...counter sunk 钉孔,钻孔(牙)...
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