以下为句子列表：
英文: The infrequency of the stomach's being such a source was central to a recent court case in which I participated as an expert witness [see box on page 79].
中文: 然而，正因为胃很少成为口臭的主因，让我最近变成一件法庭诉讼的专家证人（见〈口臭之战〉一文）。
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英文: With their greater infrequency the sounds increased in strength and sharpness.
中文: 寂静的间歇逐渐变长；声音的迟延变得难以忍受。
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