防水透声膜（1）以松弛状态固定在主体部上。
The waterproof sound passing membrane (1) in a slack state is fixed to the main body part (8).
超声耦合剂；透声媒质；卫生要求；生物学评价。
Ultrasonic coupling agent; Acoustic transmission medium; Health requirements; Biological evaluation.
本文对透声复合材料及其构件的声学性能进行了研究。
The acoustic performance of SGRP composite and structure are investigated in this paper.
结论AMD的声像学特征主要是增厚球壁层间透声裂隙。
Conclusion The main ultrasonographic manifestation of AMD is the presence of interlamellar transaudient cleft in the thickened ocular wall.
本文介绍了一种透声面元PVDF水听器的有限元分析方法。
This paper describes a finite element method analysis of an acoustically transparent planar PVDF hydrophone.
防水透声膜(1)优选使用聚四氟乙烯多孔膜或超高分子量聚乙烯多孔膜。
A polytetrafluoroethylene porous membrane or ultrahigh-molecular-weight polyethylene porous membrane can appropriately be used as the waterproof sound passing membrane (1).
结果显示肝外胆管显示长度增加，内径明显增宽，同时胆管内透声亦明显改善。
The results showed the increased length and the inside diameter of extrahepatic bile duct and the obvious improvement of ultrasound pentration.
在透声界面附近运用声学基本方程可导出边界条件的时域有限差分(FDTD)表达式。
From the basic equations in acoustics, boundary condition expressions on penetrable interfaces between media can be derived for the finite difference time domain (FDTD) method.
弥漫性淋巴细胞浸润型炎性假瘤：B超检查显示眶内肿物为低回声、透声性强的占位性病变；
B ultrasonography showed a tumor with low reflection and strong sound transmission in diffuse lymphocytic infiltrative pseudotumor.
超声观察肝外胆管内径、管壁厚度、管腔内透声、肝动脉峰值流速(PS V)、阻力指数(RI)。
Focus on extrahepatic bile duct diameter, wall thickness, lumen transparent sound, hepatic artery peak flow velocity (PSV) and resistance index (RI).
介绍了聚氨酯材料的水声特性，并重点评述了聚氨酯水声吸声材料、水声透声材料和水声反声材料的研究进展。
The underwater acoustic properties of polyurethanes were introduced. The recent research progress of underwater acoustic materials of polyurethanes was reviewed.
导出了水中透声目标表面边界条件的时域有限差分(FDTD)表达形式，将FDTD在水声学中的应用范围扩大到无切应力的有限声阻抗目标的散射问题。
The proposed finite difference boundary condition expands the scope of application of FDTD to scattering problems of objects with a finite acoustic impedance but without tangential stress.
导出了水中透声目标表面边界条件的时域有限差分(FDTD)表达形式，将FDTD在水声学中的应用范围扩大到无切应力的有限声阻抗目标的散射问题。
The proposed finite difference boundary condition expands the scope of application of FDTD to scattering problems of objects with a finite acoustic impedance but without tangential stress.
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