The physical property of piezoelectric ceramic; performance reference and empirical principle about transducer and array.

介绍压电陶瓷的物理特性，介绍有关换能器和基阵的性能参数和试验原理。

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As of this writing, the current version is still a beta, and even after it's released commercial or open source projects may improve performance over the reference implementation.

在撰写本文的时候，当前版本仍然是测试版，只有当它作为商业或开放源码项目发布以后，它的性能才可能优于参考实现。

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It provides valuable reference information that you can refer to when you develop, analyze, and troubleshoot performance issues in your MDM system.

同时提供有价值的参考信息，在开发、分析和解决MDM系统性能问题时可以参考。

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Consider focusing on the YTD performance category as an initial reference point to identify underperforming asset classes for now.

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Under the framework, reference groups will be required to identify how clinical performance should be measured.

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