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Can you bend your thumb backwards until it touches your wrist?
你是否能向后彎曲大拇指，讓它觸碰到手腕部位嗎？
If you join your hands behind your back, can you lift them over your head without letting go?
如果將雙手緊握在背后，你能否將其舉過頭頂而不松手？
If you can, you might be what some people call double-jointed.
如果你可以做到，那么你可能擁有“雙關節(jié)”。
But, A Moment of Science wonders, how could anyone have double joints?
不過，《科學一刻》想知道，人怎么可能擁有雙關節(jié)呢？
Double-jointed people don't really have two joints.
所謂“雙關節(jié)”并不是指真的擁有兩個關節(jié)。
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.
任何關節(jié)，如肩關節(jié)或拇指關節(jié)，若其四周的韌帶和肌腱的可活動范圍超出普通值，就可以被稱為“雙關節(jié)”。
Joints are created whenever two adjacent bones meet.
關節(jié)是兩骨相接而形成的。
They have fibrous bands of connective tissue called ligaments that stabilize the joint.
他們有“纖維狀”結締組織——韌帶，而韌帶能夠穩(wěn)固關節(jié)。
譯文為可可英語翻譯，未經(jīng)授權請勿轉載!
