time travel(2/6)

Alien Genius Academy Science and Technology Class Message Board:

The time is set in: 1638 AD...

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The moderator said: Because the power source is 80% solar energy and 20% intelligent

Put it on a time-space shuttle with a length, width and height of 30 cm,

Warranty period setting: 10 years...

The location is set at: Yalu River in the Bohai Sea.

at the same time,

nsional space-time 5D stereo holographic communicator.

Passerby A asked: Why do we need to shuttle between July and August?