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: Results: The specific sonographic signs of testicular torsion were that the blood flow was diminished or absent in the testicle, and there was a hyperechoic mass with no blood flow above the testicle.
中文: 结果：睾丸扭转特异性表现为睾丸内血运减少或消失以及睾丸上方无血运高回声团块。
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