Pay attention to the details. Use A/B split testing to test your hypothesis and find out what is the most effective design that achieves better results.
关注细节，运用a/b对比测试来尝试和验证你的假设，从而寻找最有效的、能得到最优结果的设计。
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He found that women generally prefer it when in photos men are looking away from the camera (hypothesis: less intimidating), and that men prefer the opposite (they want a woman's full attention).