以下为句子列表：
英文: A high density MDF cabinet with walls of varying thickness is heavily damped with bitumen and lined with anechoic grade foam.
中文: 高密度的MDF箱体四周配以不同厚度的高阻尼沥青和内衬消声泡沫。
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英文: Based on our two-dimensional approximate theoretical analysis, a transfer function model of the acoustic characteristics of underwater anechoic coating with various backings is established on the low-frequency range.
中文: 摘要在吸声覆盖层水声声管测试的实验研究中，覆盖层背衬的选择对测量结果有重大影响。
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英文: In the measurement of small sample in an acoustic cylindrical tube, measurement data with rigid backing should be taken as the standard of the performance of an anechoic coating.
中文: 在实验室小样品声管测试中，以较厚的钢柱作为背衬的测试数据来衡量吸声覆盖层性能更为合适，且易于实现。
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英文: Non infected seromas after surgery are usually anechoic collections. Fluid collections complicated by infection or hemorrhage appear more complex, with variable degrees of internal echoes, layering, and septa (Figure 2 ).
中文: 术后未感染的血清肿常为无回声的积液，并发于感染或出血的积液其表现比较复杂，内部回声程度、分层和分隔常不同（图2）。
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英文: The results show that the influences of various backings on the acoustic characteristics of anechoic coating are obviously different.
中文: 结果表明，不同背衬对吸声覆盖层吸声性能的影响具有明显不同的特性。
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