The corpus callosum, which connects the brain's left and right hemispheres and carries traffic essential to many advanced brain functions, steadily thickens.

胼胝体(连接大脑左右两半球，负责传递对高级大脑功能有重要意义的信息)在稳步增厚。

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Software is an essential element of the ubiquitous cell phone, as well as complex air traffic control systems.

软件是诸如无处不在的手机，和复杂的空中控制系统的核心元素。

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Other essential services would include air traffic controllers and federal disaster operations, as well as national weather and earthquake-monitoring operations. These would not be affected.

其他重要的部门包括空中交通管制部门、联邦救灾部门以及国家气象与地震监测部门。这些部门不会受到影响。

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"Regulating parking is essential to keep traffic flowing, pedestrians and motorists safe, roads clear for emergency services and business deliveries, deterring drivers from blocking roads and pavements, and ensuring people can park near their homes or local shops, " said Tony Ball, vice-chairman of the LGA's economy and transport board.

BBC: Parking attendants 'on the rise' across UK

The National Weather Service provides data that is essential for crop protection, traffic planning, and tourism.

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Tiger Traffic raised some essential questions for conservationists working in the field.

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