You have a middle ear infection when germs get into the middle ear and the area fills up with fluid (or pus), which contains germ-fighting cells.
当微生物进入中耳引起感染，小气袋里就会因此充满脓液，这些脓液里包含了抗菌细胞。
These white blood cells along with other debris create pus, which is what gives pimples their white or yellowish center.
这些白血细胞与其他碎片创建脓液，这是使粉刺其形成白色或微黄色的中心。
These white blood cells along with other debris create pus, which is what gives pimples their white or yellowish center.
这些白血细胞与其他碎片创建脓液，这是使粉刺其形成白色或微黄色的中心。
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