1. 另一双眼睛长在后脑勺儿上面，能看到她需要的动静，尽管没有人认为她能看得见。
And the third pair are here in the front of her head.
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2. 他的后脑勺儿上长了一个旋儿。
There is a circle on the raised part of his hindbrain.
3. 真抱歉，我把你的生日忘到后脑勺儿了！！！
I forgot your birthday.