因为我想要了解这个行业，一定要亲自购买过山寨手机才行。
Because I want to know this industry, it must be purchased in person cottage phone Cai Xing.
加州理工大学的兰热尔回应说，他并没有获得具体的数据来显示消费者在亲自购买商品前是否有使用互联网来做调查。
CalTech's Rangel said he didn't have concrete data to respond to whether consumers are using the Internet to research certain products before buying them in person.
例如，一家跟踪石油价格的ETF基金并不会亲自购买石油，而是同另外一家保证石油价格上涨时给予该基金回报的金融公司进行交易。
An ETF tracking the price of oil, for instance, might not buy oil itself, but may make a "swap" deal with another financial firm guaranteeing a payout if the price of oil goes up.
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