He drove with blithe disregard for the rules of the road.
他开车时全然不顾交通法规。
It does so with blithe disregard for best scientific practice.
没有考虑最科学的做法就轻率地这么做了。
She said 'hi' with the blithe assurance of someone who knew how much she'd been missed.
她高兴地说了声“嗨”，好像确信大家非常想念她似的。
Suzanne's feelings about food and eating had gone from blithe unconcern to anxiety.
苏珊娜对饮食的态度已经从无所谓变成了焦虑不安。
I made a blithe comment about the fine weather.
我随便说了句天气很好之类的话。