你好，
参考译文如下。
当对于您购买的东西所涉及的金额看上去太高时，它通常被使用。
It is mostly used 主句
when the amount of money involved seems too high for what you bought. 状语从句
the amount of money involved 从句主语
seems too high 从句谓语
for what you bought. 状语
what you bought. 定语从句
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