But because the way sound waves operate, we have these low sound waves taking a very long time to clear.

但鉴于声波的传播方式,低声波要过更长的时间才消失

耶鲁公开课 - 聆听音乐课程节选

Source: Brookings InstitutionDistributed power technologies that operate all or most of the time are more reliable and cleaner than those that operate only when the grid goes down precisely because they operate all of the time.

FORBES: Resiliency Portfolio Standards: Turning Smart Grids into Strong Grids

Bristol's Ferry Boat Company will run a weekend service until 10 February, when it will operate full time.

BBC: Bristol ferry to restart after consortium buys boats

James Glanz has an excellent piece in the Sunday New York Times and continuing today on how much power is consumed by data centers in the U.S. To provide fast response time, they operate near full capacity much of the time, and waste up to 90 percent of their energy consumption.

FORBES: Data Centers As Power Hogs -- Will Green Issues Impact High Frequency Trading?