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。
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.
不到十年他就积攒了五万张邮票。
He had amassed fifty thousand stamps in less than ten years.
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