海龟颈部和四肢的肌肉及骨骼的特殊设计使它能把暴露在外的部分缩回去，这样攻击者只能去咬坚硬的外壳。
The particular design of muscles and bones in the neck and limbs of the turtle allow that it can draw in its exposed parts such that an attacker can find nothing but hard shell to bite.
此外，可以采用适当方式创建此“集成”逻辑，通过使您能够在外部定义其行为，从而使得适应不断变化的需求更加容易。
Moreover, this â integrationâ logic can be created in a way that makes it easier to adapt to ever changing requirements by enabling you to define its behavior externally.
闭包功能非常强大，原因是它们使内部函数在外部函数返回时也仍然可以保留对此外部函数的变量的访问。
Closures are powerful because they enable inner functions to retain access to an outer function's variables even after the outer function has returned.
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