after much experimentation
After much experimentation, he perfected his secret blend of 11 herbs and spices and a unique cooking technique for preparing fried chicken.
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after much experimentation
经过多次试验
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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After much experimentation, the first telephone was exhibited at the Centennial Exposition of 1876 in Philadelphia.
在多次实验后，第一部电话在费城1876年百周年工业博览会上展出了。
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