Make as many funny faces as you can to exercise all of your facial muscles massaging any other tense headareas like your temples, forehead, eyebrows, and scalp.
You will notice that your baby has two soft areas on the top of his head.
你会注意到你孩子的头顶有两个柔软的部位。
《柯林斯英汉双解大词典》
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The other is for protection—and again this isn't as significant as it was once, but hair does still benefit areas of the body such as the head and around the eyes.