flash

A bright flash of lightning illuminated the entire dark valley for a split second.

(Chinese) 一道耀眼的闪电在刹那间照亮了整个黑暗的山谷。

Always use a flash when taking indoor portraits to avoid dark shadows on the subject.

(Chinese) 室内拍摄人像时务必使用闪光灯，以避免主体上出现暗影。

The thief grabbed the purse and disappeared into the crowd in a flash.

(Chinese) 小偷抓起钱包，转瞬间就消失在人群中了。

If you need help, just call me and I'll be there in a flash.

(Chinese) 如果你需要帮助，尽管叫我，我马上就到。