简单的说就是：哈希桶（Hash Bucket）指向对象句柄（Object Handles），对象句柄存有对象所占的堆内存的地址。由于对象的堆往往不只一个，Oracle习惯称这些堆为子堆。
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Chain the receiving objects and pass the request along the chain until an object handles it.
将接收对象串联成链，请求在链上传递，直到被一个对象处理。
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The object was to stand inside this frame, lift it by a pair of handles along the sides, and run up the ramp as fast as possible.
NEWYORKER: The Strongest Man in the World
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