Retailers can relieve the headaches by redesigning store layouts, pre-stocking sales items, hiring speedy and experienced cashiers, and having sales repre-sentatives on hand to answer questions.
分析主干：Retailers can relieve the headaches
1.介词by 后面带了redesigning..., pre-stocking..., hiring...,和having...等四个动名词短语作宾语，表示零售商可以采用的缓解让顾客头痛的问题的手段或方式。
2.最后一个动名词having 在句中不是表示 让(某人做某事) 的使役用法，而是表示 雇请 。后面的不定式短语to answer questions 作补语。
译文：零售商可以采取一些措施来缓解这些让顾客头疼的问题，如改造商店的布局，提前存储货品，雇用手脚麻利有经验的收银员，派出销售代表随时解答顾客的问题。
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