我珍视第一天的记忆：母亲的声音，学校大厅漂浮的灰尘。
I cherish that first-day memory: the sound of my mother's voice, the floating dust-motes in the school hall.
冰岛某火山爆发，空中漂浮的灰尘可能使数千英国游客被迫滞留机场。
Thousands of passengers face UK flight cancellations because of drifting ash from an Icelandic volcanic eruption.
尽管金属铅大部分通过汽油和油漆排放出去了，但任有一部分藏在我们看不见的地下，有时候作为灰尘漂浮在空气中。
Though the heavy metal lead is largely gone from our gasoline and paint, it still lies insidiously below us in the ground and occasionally drifts through the air as dust.
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