“稍微不注意”，或者“一不小心”，英语怎么说啊？

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a little slip from concentration
a little carelessness
一不小心 carelessly

一不小心,一不留神
In an unguarded moment

路上的坑坑洼洼骑车的人一不小心就有致命危险.
Pot-holes can be lethal for the unwary cyclist.

The slightest carelessness in feeding can result in their death.
饲养稍不小心，它们就可能死亡