With the coming of digital times, there exists emerging need to upgrade the ground transmission standards which brings both challenges and opportunities to the TV transmitter manufacturers.

指出电视数字化时代的到来、地面传输标准的升级，给我国电视发射机制造企业提出了新的挑战，同时也给企业提供了新的机遇。

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Engineers also will practice cutting off a transmission mid-stream and picking it up on another ground station.

工程师还将进行实地演练，人工切断传输中的数据流后，尝试从另一个地面站继续信息，实现断点续传。

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Wireless transmission emerged again in the 1960s, with a demonstration of a miniature helicopter powered using microwaves beamed from the ground.

20世纪60年代无线传输概念再次被提出，当时展出的一种微型直升机，通过地面发出的微波光束来供电。

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The Gulf War showed the U.S. military for the first time how important space could be to its combat operations for communications, for the transmission of imagery and even for using global positioning satellites to tell ground troops where they are.

CENTERFORSECURITYPOLICY: Grasping the Importance of Space Power

At 400 kilovolts, a standard value for long-distance transmission, an alternating current 30 metres (100 feet) from the ground has a fortieth of the loss of a similar cable at ground level.

ECONOMIST: Power transmission