Position:Aviation knowledge

The mankind drove machine success to pass through first 1999 natural cave (99/09

From;    Author:Stand originally
On December 11, 1999 afternoon 2 when 33 minutes, beisenxie drives Hungarian aerobatics division successfully machine pass through hole of door of nature of extent of Hunan Zhang Jia. This is the mankind drives machine success to pass through first natural cave.

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