like a dragonfly skimming the surface of the water -- touch on sth. without going into it deeply;(as) a dragonfly skims the water surface;scratch the surface;touch superficially ;

To make an investigation one , should go into matters deeply, not just scratch the surface.
做调查工作不能蜻蜓点水, 要深入实际.
来源:《现代汉英综合大词典》And what a fortune for that kind man who set his bread afloat upon the waters!
那个好心人蜻蜓点水施舍了几个小钱,瞧这份回报!
来源:英汉文学 - 败坏赫德莱堡The film touches on these difficult questions, but only superficially.
这部电影触及了这些难题,但只是蜻蜓点水式的。
来源:《柯林斯高阶英汉双解学习词典》
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