一般情况下，这意味着要拷贝所有组成被克隆对象内部“深度结构”（deep structure）的可变对象，然后用指向拷贝出的对象引用替换原来对这些对象的引用。
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好在它未受到深度结构问题如过度负债的困扰，因为过度负债会导致几年的经济萧条。
But it is spared the deep structural problems, such as excessive debt, which could depress growth elsewhere for several years.
用该法在浅海负梯度和均匀层情况下，计算了远程混响和回波、混响比的距离、深度结构。
The range and depth dependence of the long-range reverberation and echo-reverberation ratio were calculated for the cases of negative gradient and homogeneous layers.
这可以是任意对象，甚至可以具有一个深度嵌套的结构。
This can be any object, even one with a deep nested structure.
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