The design of successful circulation systems is not a simple matter.

设计一个成功的循环系统并不是一件轻而易举的事。

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It is shown from the simulated results that the main circulation systems in the world ocean have been represented.

从模拟结果看，全球大洋中的主要环流结构均得到体现。

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Visitors have no access to this level and use different circulation systems to go past it to the rooftop restaurant.

游客不能到达此层，会通过不同的循环通道体系直接通往屋顶餐厅。

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It seems as if it's about ready to take off, and Apple has been notoriously late to the party on many other standards (see LTE, above), but with so many iPhones in circulation this could hurt the adoption rate, just as mobile phone payment systems are getting ready for prime time.

ENGADGET: Editorial: Engadget on Apple's iPhone 5 event

It uses so-called passive systems for cooling, such as the gravity flow of water and natural circulation based on thermodynamics.

WSJ: NRC Approves Toshiba Reactor Design