"The idea that you can contain these things and have a large-scale system is not credible," said John R. Benemann, an industry consultant in Walnut Creek, Calif.

“那些想把所有东西都封闭一个大规模系统的想法并不可靠。”加州的一位行业顾问约翰·贝尼曼说。

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He pointed to a large perfect pearl the size of a small walnut that lay apart on a piece of chamois .

他指着一颗单独放在一块鹿皮上的大珠子，这珠子晶莹无瑕，有颗小核桃大小。

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Walnut trees that grow too large make it inconvenient to prune, spray, and harvest.

生长过大的核桃树，不便于修剪，喷药和采收。

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That catalog also contains neon signs, gas pumps and a 1927 Aeolian residential pipe organ so large it formerly occupied two rooms in a mansion in Walnut Lake, Mich.

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