with careful carelessness 小心翼翼又漫不经心地
With the rest of us a little carelessness this way or that did not signify; so in our dealings with him we had to be anxiously careful.
他对别人，这样那样的一点粗心不要紧，可同他打交道时，我们却得很谨慎。
You must also be careful about wearing helmets and pads because an inch of carelessness can make you suffer for the rest of your life.
您还必须小心戴头盔和焊盘，因为不小心英寸可以让你受苦了，其余的你的生活。
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