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."
韧带与肌腱通常会限制关节的活动，但是对于某些人来说，这些结缔组织非常灵活，能做出更大范围的运动，也就是我们所称的“双关节”。
In this case, it is not possible for users to miss it and there is no extra eye movement needed to read it.
在这个例子中，这样用户就不可能错过它，且没有额外的眼部移动来发现它。
Instead, scientists will have to figure out how to block movement in select locations, like in the extra-cellular matrix around growing tumors.
科学家必须解决如何抑制某些部位的运动，比如恶化的肿瘤周围的细胞外基质。
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