and though doctors have tested many times on the reason of colour-blindness.
题目
and though doctors have tested many times on the reason of colour-blindness.
答案
虽然医生已经在色盲的原因方面测试了多次
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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