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The space flight test and application situation of electric rocket engine were introduced.
介绍了电火箭的航天飞行试验和应用情况。
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The engine cracked on the first test flight.
在首次试飞时，发动机发生裂纹。
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The engine cracked on the first test flight.
在首次试飞时，发动机发生裂纹。
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