14、向下闪击（Downward flash）： 开始于雷云向大地产生的向下先导。一向下闪击至少有一首次短时雷
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... 梯级先导 stepped leader 下行雷 downward flash 允许故障频度 tolerable frequency of damage ...
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downward flash
向下的闪光
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Hard drive shipments have been on a downward path as flash drives and tablets eat into their market, according to a report by iSuppli cited by Bloomberg, and will fall by about 4% on a sequential basis in the first quarter of 2011.
FORBES: Consolidation In The Hard Drive Market As Western Digital Pays $4.3 Billion For Hitachi's GST Unit
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