New Words：

cave [keiv] n. 洞穴；山洞
lightning ['laitniŋ] n. 闪电

Sample Sentences：

The lightning flashed across the sky.
He was struck by lightning and killed.
I'll be waiting for you at the cave mouth.
Another flash of lightning lit up the cave.
They hid themselves in the cave in order not to be seen by the enemy.

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