Checking is easy but expensive (you have to make an extra call to SimpleDB, which is slow since it's a whole HTTP round trip plus the processing time on Amazon's side).
要进行检查也很简单，但是需要付出开销(您必须额外调用SimpleDB，而调用会很慢，因为需要完整的HTTP往返以及amazon端的处理时间)。
He would not even think about lending me a helping hand with anything, yet I agreed to take the extensive eight hour round trip car ride, just to make moving less of a hassle.
他从来就没有想过要帮我，但我还是答应往返8小时开车送他，仅仅是为了减少一点旅途的寂寞。
Due to the influences in the solar system and from outside the solar system, the Earth will make her round trip once a year.
由于太阳和来自于太阳系之外的影响，地球的公转周期仍然是一年一次。
I wish I could have enough money to make a trip round the world.
我多希望我有足够的钱去环球旅行啊！
I wish I could have enough money to make a trip round the world.
我多希望我有足够的钱去环球旅行啊！
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