n.[U]

1. 閃電，電光
   The little girl is afraid of thunder and lightning.

   這小女孩害怕雷聲和閃電。

2. 意外的幸運

a.

1. 閃電的；閃電似的
   They raided the enemy positions with lightning speed.

   他們以閃電般的速度襲擊了敵軍陣地。

vi.

1. 閃電

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.