Level 4 - Unit 1 - Part 3 Vocabu

The heart pumps blood to all parts of the body through a system of arteries and veins. It's located in the chest, between the lungs, and beats about once per second.
心脏将血液通过动静脉系统输送到身体的各个部位。 心脏位于胸腔，两肺之间，大约每秒跳动一次。

The kidneys remove waste and toxins from the blood. They are bean shaped organs and are about 10 centimeters long and 6 centimeters wide.
肾脏排出血液中的废物和毒素，形状为豆形，长约10厘米，宽约6厘米。

The lungs exchange oxygen from the air with carbon dioxide from the blood. They expand when inhaling air, and contract when exhaling air.
肺用于空气中的氧气和血液中的二氧化碳进行交换，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. It uses acids to digest food before passing it to the small intestine.
胃位于心脏下方，属于消化系统的一部分。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. In an adult, the bladder can hold about half a liter of urine.
膀胱呈气球状，收集来自肾脏的尿液。成年人的膀胱大约可以容纳半升的尿液。