It involved a series of black letters presented in the centre of a white screen. Each letter was shown for half a second and followed by a blank screen for two seconds before the next letter appeared.
一系列的黑色字母会出现在屏幕中央，每个字母呈现半秒，下个字母出现前持续两秒的空屏，要求参与者尽可能快速而准确地指出每个字母是否与前两个字母出现的字母相匹配。
Video footage of the simulation showed four masked men, dressed in black and carrying machine guns, emerge from a car and fire blank rounds at pretend bystanders and police officers.
仿真录像画面现实四个蒙面男子，装着黑色，携带机枪，从一辆汽车里出来，对假装的路人和警察打空枪。
The green eyes found the black, but after a second something in the depths of the dark pair seemed to vanish, leaving them fixed, blank and empty.
哈利的绿眼睛转向了他，但过了不久，那双黑色眼睛深处的光芒渐渐凝固，变得空洞了。
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