Maintenance should first check the tire pressure, wear, nut loose or fall off, remove the twins or tread on the inserts and nails and other sharp objects.
养护时首先应查看轮胎气压、磨损状况，螺母有无松动或掉落，除去双胎间或胎面上的嵌入物及铁钉等尖利杂物。
Punch down any loose nails so that the floor is quite smooth.
把所有松动的钉子都钉进去，使地板平滑。
Now this classroom was very old, and the blackboards, which had been nailed on to the walls with old black iron nails, had become loose over the years.
㗕上课的教室已十分破烂，黑板是用那些老式的黑铁钉钉在墙上的。经过这么多年，钉子已经松动了。
Now this classroom was very old, and the blackboards, which had been nailed on to the walls with old black iron nails, had become loose over the years.
㗕上课的教室已十分破烂，黑板是用那些老式的黑铁钉钉在墙上的。经过这么多年，钉子已经松动了。
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