- 对称: symmetry; symmetrical
- 膜片: diaphragm; membrane; film
- 不对称膜片: unsymmetrical diaphragm
- 非对称膜: anisotropic membrane; asymmetric membrane
- 膜片: [工声] diaphragm; membrane; film◇膜片避雷器 film lightning arrester; 膜片阀 diaphragm valve; 膜片控制阀 diaphragm control valve; 膜片喇叭 diaphragm horn; 膜片弹簧 diaphragm spring; 膜片调节器 diaphragm regulator; 膜片真空计 diaphragm vacuum gauge
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