与摄影器材、舞台灯光类似，它属于活动经济的一部分，而活动经济本身具有明显的淡旺季波动。只要旺季结束，设备闲置率就会上升。
The top three TV deals to shop this weekend:，这一点在91视频中也有详细论述
Late summer rain is causing havoc across Australia, with South Australia on flood watch, Victoria cleaning up after a downpour, and Sydney issuing a shark warning after heavy falls.，这一点在heLLoword翻译官方下载中也有详细论述
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Struggles in low light