Next year will mark the 40th anniversary of the opening for signature of the Outer Space Treaty (OST), as well as the 50th anniversary of the launch of SPUTNIK. Discussion of these issues is therefore timely.
2. 明年将是《外层空间条约》开放供签署40周年，以及第一颗人造卫星发射50周年，因此，讨论这些问题是及时的。