The current at the channel base is specified, and use two time constants can get the much better shapes than single time constant.

模型对于特定的雷电通道底部电流，采用了汉时间常数，取得了比单时间常数更好的拟合效果。

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The "mantle plume" thus formed, once established, continues to channel hot material from the mantle base until the reservoir is emptied.

这样形成的“地幔柱”一旦形成，就会继续从地幔底部引导热物质，直到储层被排空。

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The formation of the channel is initiated when electrons surge from the cloud base toward the ground.

当电子从云层底部涌向地面时，通道就开始形成了。

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Revenues are being squeezed while programming costs some 60-70% of the channel's cost base, according to Mark Harrington of Bear Stearns are soaring.

ECONOMIST: A television company in trouble

The growth of internet shopping and relocation of some UK companies to take advantage of the relief prompted some to criticise the Channel Islands as a base for the "exploitation" of the system.

BBC: Packages being sorted before posting

After explaining the basic process by which mobile phones authenticate then get an open channel on a GSM base station or network tower, the Grugq then offered up a series of ways that this process could be thwarted.

FORBES: Cell Phone Snooping: Cheaper And Easier Than Ever