时差N小时 如何判断自己是不是双关节?(上)

Can you bend your thumb backwards¹ until it touches your wrist?

你是否能向后弯曲大拇指，让它触碰到手腕部位吗？

If you join your hands behind your back, can you lift them over your head without letting go?

如果将双手紧握在背后，你能否将其举过头顶而不松手？

If you can, you might be what some people call double-jointed.

如果你可以做到，那么你可能拥有“双关节”。

But, A Moment of Science wonders, how could anyone have double joints³?

不过，《科学一刻》想知道，人怎么可能拥有双关节呢？

Double-jointed people don't really have two joints.

所谓“双关节”并不是指真的拥有两个关节。

Any joint², 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.

任何关节，如肩关节或拇指关节，若其四周的韧带和肌腱的可活动范围超出普通值，就可以被称为“双关节”。

Joints are created whenever two adjacent bones meet.

关节是两骨相接而形成的。

They have fibrous bands of connective tissue called ligaments that stabilize⁴ the joint.

他们有“纤维状”结缔组织——韧带，而韧带能够稳固关节。

1 backwards   

adv.往回地，向原处，倒，相反，前后倒置地

参考例句：

• He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。
• All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。

2 joint   

adj.联合的，共同的；n.关节，接合处；v.连接，贴合

参考例句：

• I had a bad fall,which put my shoulder out of joint.我重重地摔了一跤，肩膀脫臼了。
• We wrote a letter in joint names.我们联名写了封信。

3 joints   

接头( joint的名词复数 )； 关节； 公共场所（尤指价格低廉的饮食和娱乐场所） （非正式）； 一块烤肉 （英式英语）

参考例句：

• Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
• Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。

4 stabilize   

vt.（使）稳定，使稳固，使稳定平衡；vi.稳定

参考例句：

• They are eager to stabilize currencies.他们急于稳定货币。
• His blood pressure tended to stabilize.他的血压趋向稳定。