The range through these states is mediated by the arousal system, a network of tracts converging from sensory systems to integrating centers in the brain stem.

这些状态的变化是以激发系统作为媒介完成的，而所谓激发系统，是指从各个感觉系统汇聚到位于脑干中整合中心的一个网络。

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It shares, with Canada, the second longest river system in North America and has over half the coastline of the United States.

它与加拿大共享北美第二长的河流系统，拥有美国一半以上的海岸线。

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The interior power system of private universities in the United States contains: board of directors, president, and faculty senate.

美国私立大学内部的权力体系主要由董事会、校长和教授评议会构成。

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This week,we tell about the biggest system of freshwater lakes in the world, the Great Lakes between the United States and Canada.

VOA: special.2009.11.11

But if the system is in equilibrium, none of those states has lower enthalpy.

但是如果系统处于平衡态，所有其他的态都不可能具有更低的自由焓。

麻省理工公开课 - 热力学与动力学课程节选

But Hobbes lived at a time when the modern system of European states even as we understand them today, was just beginning to emerge.

霍布斯生活在一个时代,这个时代中，现代欧洲国家,就像我们今天理解的这样，已经快要出现了。

耶鲁公开课 - 政治哲学导论课程节选

For of course we have the entire patent system of the United States of America telling us that the two are absolutely not the same thing.

FORBES: Did Steve Jobs Get That List Scrolling Bounce Back Patent From Atari?

Following the success of the communication test exercise of 10 August 2011 involving 31 National Tsunami Warning Focal Points from the region, a full-scale exercise named NEAMWave12 is planned in the fourth quarter of 2012 to test the readiness of the system and of the Member States.

UNESCO: EDUCATION

One thing we can all agree on though is that the tax system of the United States must be overhauled.

FORBES: Guest Post: Tax Reform