1. Selling out of the warehouse originally refers to offsetting the original futures contract through a futures transaction with the same quantity and opposite direction, so as to understand the futures transaction, relieve the obligation of due physical delivery, and return the purchased or ordered goods to the original sales unit or production unit.

2. The astronaut's extravehicular activity means that the astronaut opens the extravehicular door and walks out of it. After completing the mission of extravehicular activities, the astronauts will enter the airlock and close the hatch in the specified way.