Research has found that people with back pain, particularly lower back pain, tend to sleep more comfortably on mattresses that hover around the medium-firm level, as opposed to beds that are the firmest of firm. Your bed should be supportive to your spine and body, but not so firm that you’re uncomfortable.
from research organizations
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* @param {string} num 非负整数的字符串形式（可能含前导零）
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Последние новости
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