In the Soviet Union, sightings of UFOs were often prompted by tests of secret military rockets.
在苏联，U FO目击常常被认为是秘密的军事火箭测试。
This collection included, by the way, a series of 175 stamps with portraits of cosmonauts, rockets, and dogs, issued from '57 on, in honor of the Soviet space program.
顺便说一下，这个集邮本包括一套从1957年积攒下来的庆祝苏联航天计划的邮票，宇航员、火箭、狗的肖像一应俱全，总共175枚。
Thereafter, America vied with the Soviet Union for supremacy in aerospace's equivalent of "mine's bigger than yours", as successively taller rockets lobbed larger payloads further afield.
从此以后，美苏展开了对太空霸权的竞争，不停地追求“更大”：更高的火箭携带更多的有效载荷到达更远的空间。
The Soviet Union, United States and China are the only countries that have put people in space with their own rockets.
苏联、美国和中国是世界上仅有的三个用自己的火箭把宇航员送上太空的国家。
The Soviet Union, United States and China are the only countries that have put people in space with their own rockets.
苏联、美国和中国是世界上仅有的三个用自己的火箭把宇航员送上太空的国家。
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