The heart pumps blood to all parts of the body through a system of arteries and veins 心臟通過(guò)動(dòng)脈和靜脈供血到全身
It's located in the chest丁稀，between the lungs娱局，and beats about once per second 它在胸口里兩肺之間艳馒，每秒跳動(dòng)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 腎從血液里排出廢物和毒素跺涤，它們是豆子形狀的器官大約長(zhǎng)10厘米寬6厘米
The lungs exchange oxygen from the air with carbon dioxide from the blood仲墨，they expand when inhaling air 勋磕，and contract when exhaling air 肺用血液里的二氧化碳與空氣中的氧氣置換.當(dāng)吸氣時(shí) 它們擴(kuò)張悼枢，當(dāng)呼出氣時(shí)它們收縮
Exchange A with B ：用B 跟A 交換
The stomach is below the heart，and its part of the digestive system. it uses acids to digest food before passing it to the small intestine 胃在心臟的下面综看，他是消化系統(tǒng)一部分品腹，進(jìn)入小腸前它用胃酸消化食物
The bladder is a balloon shaped organ that collects urine from the kidneys. in an adults the bladder can hold about half a liter of urine 膀胱是氣球形狀的器官，從腎里收集尿液红碑，在成年人的膀胱能保存大約半升的尿液
