用英文翻译1 血液从左心室流出到达主动脉---全身最大的动脉然后从此处血管开始进行连续不断的分支成为大大小小的血管直达全身各处。 2 整个呼吸道有三层保护屏障一是鼻毛阻挡异物如细菌、病毒和灰尘等进入呼吸道；二是气管上皮细胞分泌的粘液将异物粘住并随粘膜上皮的纤毛运动将其排出；三是肺泡内有一种细胞可吞噬肺泡内的异物。
- Blood flows from the left ventricle to the aorta - the largest artery in the body, and from there, blood vessels begin to continuously branch out into smaller and smaller vessels, reaching all parts of the body.
- There are three protective barriers in the entire respiratory tract. First, nose hair blocks foreign objects such as bacteria, viruses, and dust from entering the respiratory tract. Second, the mucus secreted by the tracheal epithelial cells sticks to foreign objects and is carried out by the cilia movement of the mucosal epithelium. Third, there is a type of cell in the alveoli that can engulf foreign objects in the alveoli
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