A smile flash across his face.

他的脸上闪过一丝微笑。

A bolt of lightning flash across the sky.

天空中闪过一道闪电。

Zigzag bolts of lightening flash across the sky the clap of thunder echoes across the water.

锯齿形的道道闪电相继划破长空,声声雷鸣在水面上回响.