剧场的座位是急剧倾斜的，通常为2：1的坡度，给予观众们良好的视线并且减少了掠射衰减。
The seating was steeply sloped in these structures, typically 2:1, which afforded good sight lines and reduced grazing attenuation.
由于大气衰减的影响，非视线散射大气光通信需要使用光学天线以提高对光信号的采集能力，进而增加通信距离。
The primary function of the optical transmit antenna is to collimate far-field divergence of the laser beam and reduce the size of the laser beam in .
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