★英語(yǔ)聽(tīng)力頻道為大家整理的高中英語(yǔ)聽(tīng)力材料下載：為什么有些人是雙關(guān)節(jié)，供大家參考。更多閱讀請(qǐng)查看本站英語(yǔ)聽(tīng)力頻道。
Why Are Some People Double-Jointed? 為什么有些人是雙關(guān)節(jié)？
Can you bend your thumb backwards until it touches your wrist? If you join your hands behind your back, can you lift them over your head without letting go? 你是否能將大拇指向后彎曲直至其觸碰到手腕部位？你將雙手在背后緊握，是否能夠?qū)⑵渑e過(guò)頭頂而不松手？
If you can, you might be what some people call “double-jointed.” But, A Moment of Science wonders, how could anyone have double joints? 如果你能做到，那么你可能擁有雙關(guān)節(jié)。但是，《科學(xué)一刻》想知道，一個(gè)人怎么可能擁有雙關(guān)節(jié)呢？
Range Of Motion 活動(dòng)范圍
Double-jointed people don’t really have two joints. Any joint, such as the thumb joint or the shoulder, can be called “double-jointed” if the tendons and ligaments surrounding the joint allow a wider range of motion than is usual. 所謂雙關(guān)節(jié)的人并非真正擁有兩個(gè)關(guān)節(jié)。任何關(guān)節(jié)，如肩關(guān)節(jié)或拇指關(guān)節(jié)，若圍繞其四周的韌帶和肌腱的活動(dòng)范圍超出平常，則可被稱為“雙關(guān)節(jié)”。
Joints are created whenever 2 adjacent bones meet. They have fibrous bands of connective tissue called ligaments that stabilize the joint. Connective tissues also form the tendons that join the bones to the muscles. 關(guān)節(jié)是兩骨相接而形成的。他們含有被稱為韌帶的結(jié)締組織纖維帶，韌帶能夠穩(wěn)定關(guān)節(jié)。結(jié)締組織同時(shí)也組成了連接肌肉與骨頭的肌腱。
Ligaments and tendons usually restrict the movement of the joint, but in some people, these normally restrictive tissues can be quite flexible and allow the extra movement we call “double-jointed.” Practice can increase a joint’s natural flexibility just the way stretching can increase your muscles’ flexibility. 韌帶與肌腱通常會(huì)限制關(guān)節(jié)的活動(dòng)，但是對(duì)于某些人來(lái)說(shuō)，這些結(jié)締組織非常靈活，能做出更大范圍的運(yùn)動(dòng)，也就是我們所稱的“雙關(guān)節(jié)”。通過(guò)鍛煉能增加關(guān)節(jié)的自然柔韌性，正如伸展運(yùn)動(dòng)可加強(qiáng)肌肉的柔韌性一樣。
Flexibility 柔韌性
While flexible joints are very useful to contortionists, some joints can become so loose that they are unstable. This allows the bones of the joint to slip out of their sockets and can be very damaging. 靈活的關(guān)節(jié)對(duì)柔術(shù)演員來(lái)說(shuō)至關(guān)重要，但他們的一些關(guān)節(jié)可能會(huì)變得十分不穩(wěn)固。這很容易造成關(guān)節(jié)脫臼，對(duì)身體造成很大的傷害。
Strengthening the muscles around the joint can stabilize it and still allow you to show off your trick joint at parties. 加強(qiáng)關(guān)節(jié)周圍肌肉的鍛煉能夠使關(guān)節(jié)穩(wěn)固，并且你依然可以在各式派對(duì)上炫耀你的小把戲。
Why Are Some People Double-Jointed? 為什么有些人是雙關(guān)節(jié)？
Can you bend your thumb backwards until it touches your wrist? If you join your hands behind your back, can you lift them over your head without letting go? 你是否能將大拇指向后彎曲直至其觸碰到手腕部位？你將雙手在背后緊握，是否能夠?qū)⑵渑e過(guò)頭頂而不松手？
If you can, you might be what some people call “double-jointed.” But, A Moment of Science wonders, how could anyone have double joints? 如果你能做到，那么你可能擁有雙關(guān)節(jié)。但是，《科學(xué)一刻》想知道，一個(gè)人怎么可能擁有雙關(guān)節(jié)呢？
Range Of Motion 活動(dòng)范圍
Double-jointed people don’t really have two joints. Any joint, such as the thumb joint or the shoulder, can be called “double-jointed” if the tendons and ligaments surrounding the joint allow a wider range of motion than is usual. 所謂雙關(guān)節(jié)的人并非真正擁有兩個(gè)關(guān)節(jié)。任何關(guān)節(jié)，如肩關(guān)節(jié)或拇指關(guān)節(jié)，若圍繞其四周的韌帶和肌腱的活動(dòng)范圍超出平常，則可被稱為“雙關(guān)節(jié)”。
Joints are created whenever 2 adjacent bones meet. They have fibrous bands of connective tissue called ligaments that stabilize the joint. Connective tissues also form the tendons that join the bones to the muscles. 關(guān)節(jié)是兩骨相接而形成的。他們含有被稱為韌帶的結(jié)締組織纖維帶，韌帶能夠穩(wěn)定關(guān)節(jié)。結(jié)締組織同時(shí)也組成了連接肌肉與骨頭的肌腱。
Ligaments and tendons usually restrict the movement of the joint, but in some people, these normally restrictive tissues can be quite flexible and allow the extra movement we call “double-jointed.” Practice can increase a joint’s natural flexibility just the way stretching can increase your muscles’ flexibility. 韌帶與肌腱通常會(huì)限制關(guān)節(jié)的活動(dòng)，但是對(duì)于某些人來(lái)說(shuō)，這些結(jié)締組織非常靈活，能做出更大范圍的運(yùn)動(dòng)，也就是我們所稱的“雙關(guān)節(jié)”。通過(guò)鍛煉能增加關(guān)節(jié)的自然柔韌性，正如伸展運(yùn)動(dòng)可加強(qiáng)肌肉的柔韌性一樣。
Flexibility 柔韌性
While flexible joints are very useful to contortionists, some joints can become so loose that they are unstable. This allows the bones of the joint to slip out of their sockets and can be very damaging. 靈活的關(guān)節(jié)對(duì)柔術(shù)演員來(lái)說(shuō)至關(guān)重要，但他們的一些關(guān)節(jié)可能會(huì)變得十分不穩(wěn)固。這很容易造成關(guān)節(jié)脫臼，對(duì)身體造成很大的傷害。
Strengthening the muscles around the joint can stabilize it and still allow you to show off your trick joint at parties. 加強(qiáng)關(guān)節(jié)周圍肌肉的鍛煉能夠使關(guān)節(jié)穩(wěn)固，并且你依然可以在各式派對(duì)上炫耀你的小把戲。