以下为句子列表：
英文: Extensive bellows seal qualification testing has been performed in the research and development department to prove the bellows cycle life.
中文: 在研究发展部进行的扩展波纹管密封合格测试证明波纹管的使用寿命。
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英文: In order to predict reliability, a sound valve design must be backed up up by a stress analysis and functional qualification testing under critical operating conditions.
中文: 为了预测可靠性，一个可靠的阀门设计必须通过临界操作条件下的应力分析和功能合格测试。
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