... trial stretch ==> 试验范围 trial substitution ==> 试换法 trial tapping ==> 试剖 ...
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trial substitution
试验替代
以上为机器翻译结果，长、整句建议使用 人工翻译 。
As an operation for trial, exploration and technology used by the ancients, with the principle of mystery and fantasticism, alchemy surprisingly at last became the substitution of deceiving.
它作为古人的一种试验、探索、技术操作，循着神秘而荒诞的思路，却成了行骗的代名词。
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