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.
如果核心暴露在外，其热辐射就会加热迸散的气体，使之发光。
When the core is exposed, its radiation heats the ejected gas, making it glow.
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