内部器官
The heart pumps blood to all parts of the body through a system of arteries and veins.心脏通过动脉和静脉系统将血液输送到身体的各个部位。
It's located in the chest, between the lungs, and beats about once per second.它位于胸腔，在两肺之间，大约每秒跳动一次。
The kidneys remove waste and toxins from the blood.肾脏排出血液中的废物和毒素。
They are bean shaped organs and are about 10 centimeters long and 6 centimeters wide.它们是豆形的器官（脏器），长约10厘米，宽约6厘米。
The lungs exchange oxygen from the air with carbon dioxide from the blood.肺把空气中的氧气和血液中的二氧化碳交换。
They expand when inhaling air, and contract when exhaling air.它们吸入空气时膨胀，呼出空气时收缩。
The stomach is below the heart, and it's part of the digestive system.胃在心脏下面，它是消化系统的一部分。
It uses acids to digest food before passing it to the small in testine.在食物进入小肠之前，它利用酸来消化食物。
The bladder is a balloon-shaped organ that collects urine from the kidneys.膀胱是一个气球状的器官，从肾脏收集尿液。
In an adult, the bladder can hold about half a liter of urine.成年人的膀胱可以容纳大约半升的尿液。
The lungs are used for breathing.
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