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Explanation: Wilman的问题可能来自rfa.org, 我看了看上下文，这好这一句就是讲反光的。所以我判断，在这里，white flashes应该就是留在图像中的白色光点。
“ Use a shiny refiector, though, and the light will stay fairly narrow on the bounce. The most extreme type of shiny refiector—a mirror—will keep the light focused pretty much as narrowly in the refiection.
Tip: Crumple a big piece of aluminum foil, spread in out again, and wrap it around a piece of cardboard, shiny side out. It makes a good reflector that’s not quite as soft in effect as a matte white surface—great for adding sparkly highlights.