您可能注意到Photo是在 findById 中通过一个Key 获取的，但是请不要担心它是怎么获得的：在本文中，您只需要将Key看作是封装的id 域。
You might notice that Photos are fetched with a Key in findById, but don't worry about it: For the purpose of this article, just think of Key as a wrapper around the id field.
不要担心钱的问题，因为当你们全部的需要都是免费供应的时候，它是不必要的。
No worrying problems about money, as it is unnecessary when all of your needs are freely provided for.
不要担心，如果它是任何类似于我买的中国制造的吸尘器一样，它将会在航行6个月后沉没。
Don't worry, if it's anything like the vacuum cleaner I bought that's made in China, it'll last 6 months before it sinks.
不要担心，如果它是任何类似于我买的中国制造的吸尘器一样，它将会在航行6个月后沉没。
Don't worry, if it's anything like the vacuum cleaner I bought that's made in China, it'll last 6 months before it sinks.
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