如果你在为一个方案进行研究或者只是在线比较商品价格，这将是个有用的工具。
If you're collecting research for a project or just doing some online comparison shopping, this can be a valuable tool.
这主要不是由于技术原因，而是由于在线商家希望保护商品价格的隐私权。
This is mainly not due to technical reasons, but because online merchants want to protect the privacy of commodity prices.
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