Chapter 599: Weapon Reserves, Unexpected Surprise

"Sand or crushed stones!"

"To build roads, just mix cement, crushed stones, and water."

"To build walls, just mix sand, cement, and water."

If Ying Ying Zi Ye hadn't said it, they might not have figured it out even if they studied for a while longer.

Sand?

Crushed stones?

The two fell into deep thought.

This was something they hadn't thought of at all.

Just by adding these two things, this cement could become exceptionally hard?

Now that they had the method, they wanted to try it immediately.

Sun Wu saw some sand in the garden and scooped it into the small basin with his hands.

The basin contained cement, and he put the sand in.

Ying Ying Zi Ye guided from the side, about a half-and-half ratio.

Just add water and mix; after doing all this, just wait quietly. ===== CHAPTER 601 =====