But in the United States in the 1930s and 1940s, he was no less valuable, if not so publicly celebrated, as a pioneer in American jet and rocket technology.
在20世纪三、四十年代的美国，即使他尚未如此名满天下，但作为美国喷气式飞机及火箭技术先驱，其价值却一样宝贵。
This is a book which tells about rocket technology.
这是一本关于火箭技术的书。
This is a book which tells about space rocket technology.
这是一本关于宇宙火箭技术的书。
This is a book which tells about space rocket technology.
这是一本关于宇宙火箭技术的书。
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