You have to file away for hours to get this metal smooth.
你要想你这块金属光滑，必须用锉刀不停地锉上几小时。
You have to file away for hours to get this metal smooth.
你得锉上几个小时才能使这金属变得光滑。
Billy: Well, I use the file to smooth the dead skin on my feet.
比利：嗯，我用锉刀来锉我脚上的死皮。
You have to file away for hours to get this metal smooth.
你得锉好几个小时才能锉平这块金属。
He used a file to smooth the corner of the wood.
他用锉刀把木材的边角磨平了。
He used a file to smooth the corner of the wood.
他用锉刀把木材的边角磨平了。
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