She stared at the floor, idly playing with the strap of her handbag.
她盯着地板，随手摆弄着手提包的提带。
One evening before supper, the father noticed his son playing with a piece of wood on the floor.
一天晚饭前，父亲注意到儿子在地板上玩一块木头。
Young children playing on the floor are particularly at risk to mercury’s effects on the central nervous system.
儿童在地板上玩特别容易受到水银对中枢神经系统的影响。
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