keep their footing
站稳脚跟
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The wealthy had SLATE floors that would get slippery in the winter, when wet, so, they spread thresh on the floor to help keep their footing.
富人家有石板地面，冬天受潮后会很滑，因此他们在地上铺灯芯草，这样才能走得稳。
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