很大一块管体感的大脑皮层实体是专门负责管手的，如果人手不能很好地适合人的需求，帮助人对付困境， 它就不会是现在这个样子。
A lot of human somatosensory cortical real estate is devoted to the hands; it wouldn’t be if the hands weren’t so well-suited to human needs and predicaments.
当材料断裂，荚囊就会打开并释放出修复介体，介体变成实体的复合物填补裂缝从而恢复材料的特性。
When the polymer cracks, the capsules break open and release the healing agent, which becomes polymer solid and seals the crack and restores the material's properties.
它是SimpleRDB的通用模型的第一个类实体，但是在UML 2.0中没有它的对等体。这就是关联的签名没有与uml元素相关的形式参数的原因。
It is a first class entity in the meta-model of SimpleRDB, but it has no equivalent in UML 2.0. That is why the signature of the relation has no formal parameter that relates a UML element.
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