科学家：儿童新冠肺炎症状较轻是因为常得感冒
<p>对新冠疫情的监测发现，儿童的发病率较低，症状也较轻。这是为什么呢？科学家认为，这可能是因为儿童经常得感冒，免疫系统已经做好了充分准备。</p><p><span word="Children">Children</span> <span word="may">may</span> <span word="be">be</span> <span word="protected">protected</span> <span word="from">from</span> <span word="coronavirus">coronavirus</span> <span word="because">because</span> <span word="they">they</span> <span word="catch">catch</span> <span word="so">so</span> <span word="many">many</span> <span word="colds">colds</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="suggested">suggested</span>.</p><p>科学家指出，儿童经常感冒可能会保护他们免受新冠病毒的伤害。</p>
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