Methods We analyzed the reasons of two-times puncture with Pareto, and found the measures of improving skill of infant venous transfusion.

方法应用帕累托图对婴儿静脉输液二次穿刺进行原因分析，提出婴儿静脉输液技术的改进措施。

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This is something of a puzzle, since as Bryan Caplan has pointed out even under the most pessimistic estimates the gains from immigration to the winners far outweigh the losses to the losers so pareto improving bargains with large immigrant numbers are possible.

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This is not what economists call a Pareto, or welfare, improving policy.

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