据悉，在宣布这项惊人发现之前，科学家反复进行该项实验长达6个月；9月份，最初研究结果的震惊了科学界。
Tested and re-tested for six months before it was announced, the initial finding shocked the science world in September.
科学家反复向20只狗展示半张人类的笑脸或怒容图片——要么是只有嘴的下半部分，要么是只有眼睛的上半部分。
The scientists repeatedly showed 20 dogs half pictures - either the lower mouth region or the upper eye area - of happy or angry human faces.
可是手机在市场上的爆炸式增长，以及使用者倾向于将他们贴身携带和通话时反复置于同一只耳朵上，使得科学家们不得不再一次审视它的使用安全。
But cell phones' explosion in the marketplace, and users' tendency to wear them close to the body and hold them repeatedly to the same ear, have led scientists to take a second look.
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