It's not reliable to judge a product only by its appearance.

单凭外观来判断一个产品是不可靠的。

youdao

"I purchased what I thought was a top-of-the-line product only to be terribly disappointed," one user wrote Tuesday. "This is my first iPhone and may well be my last."

“我曾认为自己购买的是一款高品质的产品，但现在我完全失望了，”这周二，一位用户这样写道，“这是我第一台iPhone，也会是最后一台。”

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Note: this relates to trial product only, not direct buy links.

注：这只针对试用产品，与直接购买链接无关。

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Oil became a useful product only in the middle of the eighteen hundreds.

VOA: special.2010.02.25

A product like Windows is in a sense only as good as it's last release or two.

如“视窗“一样的产品不过是,和它之前推出的如出一辙而已。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

We'll assume that each consumer buys one and only one product.

我们假设每个消费着买且只买一个产品

耶鲁公开课 - 博弈论课程节选

Gillette, boasts Al Zeien, the company's 68-year-old chairman, launches a new product only when it has made a genuine technical advance.

ECONOMIST: Gillette

But just like your electric power company, you can sell your product only at a price acceptable to Canada's minister of health.

FORBES: Gouging The Drug Companies

If the product is only a third mechanical, we can own the physical product for a long time but it can evolve over time.

FORBES: The New Manufacturing Lifecycle: An Interview With PTC's Hepplemann