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The result of this experiment was not noticeable for a long period.
这个实验结果长期不显著。
《新英汉大辞典》
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The result of the experiment was not noticeable for a long period.
那项试验的结果好长一段时间没有引起注意。
youdao
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The result of the experiment was not noticeable for a long period.
那项试验的结果好长一段时间没有引起注意。
youdao