"What is this?"

Cao Cao saw that the teacher glanced at the wall clock on the wall, his eyes showed a little surprise, and he asked softly.

"Oh, this is also developed in the craftsman's academy, and it is because of these things that we can control time more accurately."

The teacher has ......

"Three Kingdoms, Summoning Li Yuanba at the Beginning" Chapter 598 Liu Xie's ascension to the throne is in the middle of a hand-to-hand fight, please wait a moment,

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