n.[U]

1. 闪电，电光
   The little girl is afraid of thunder and lightning.

   这小女孩害怕雷声和闪电。

2. 意外的幸运

a.

1. 闪电的；闪电似的
   They raided the enemy positions with lightning speed.

   他们以闪电般的速度袭击了敌军阵地。

vi.

1. 闪电

n.

1. the occurrence of a brief natural high-voltage electrical discharge between a cloud and the ground or within a cloud, accompanied by a bright flash and often thunder.
2. [as modifier] very quick:
   lightning speed.