以下为句子列表：
英文: A memorial service marking the 40th anniversary of the 1967 Apollo 1 accident. A fire in the cockpit during a routine test killed all three astronauts onboard.
中文: 美国宇航局为1967年发生的阿波罗一号意外事故举行了40周年纪念。在一次例行试验当中，阿波罗一号的驾驶舱突然起火，3名宇航员全部殉难。
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英文: By routine test and base experience, with contrastive method, the appropriate mix content and the effect to concrete strength of a kind of expansion agent were studied.
中文: 摘要通过常规实验和基础实验，采用对比的方法，研究了膨胀剂的适宜掺量和对水泥砂浆强度的影响。
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