这就是为什么当我们不留神，我们的想象力就像脱缰的野马，不可避免地为我们带来许多问题。
This is why when we are inattentive, our imaginations run wild and will inevitably create many problems for us.
一年冬天，外面下起了大雪，大地披上了白色的银装，妻子站在桧树下，一边欣赏着雪景，一边削着苹果，一不留神，小刀切到了手指头，滴滴鲜血流出来洒在了雪地上。
One day in winter the woman was standing beneath it, peeling herself an apple, and while she was thus peeling the apple, she cut her finger, and the blood fell into the snow.
尽管如此，实践与理论之间存在着巨大的差距，一不留神就会犯下错误。
But the gap between theory and practice leaves lots of room for mistakes.
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