The spear and shield invented the tank, what and what invented what,

Hats and steel invented bulletproof helmets!

Hair dryer wind deflector?

Light bulbs and caps?

Conductive Conductors, Semiconductors, Insulators?

Relays Arc extinguishers?

Bullets bulletproof glass?

Nuke Vault?

The tank is a combination of an offensive spear and a defensive shield. In military affairs, there are many examples of combining spear and shield, typical of which is the pillbox.

Pillboxes are fortified buildings that play a defensive role in the military, and are mostly built of bricks, stones, reinforced concrete, etc. So from a defensive point of view, it is a solid "shield". But the pillboxes also had firing ports, through which the defenders hidden in the bunkers could deliver effective strikes against the enemy.

Even in some large-scale offensive battles, in order to compress the encirclement of the enemy and at the same time minimize your own personnel**, it is also a common tactic to build pillboxes and advance steadily step by step.

In addition, in real life, there are many examples of combining spears and shields, such as pencils with eraser heads. A pencil can be used to write words, while an eraser head can erase mistakes.

A battleship is a collection of spears and shields, and so are American Aegis ships, which are both offensive and defensive. Hope it helps!

The first part tells that the inventor is armed with a spear and a shield, and in the process of fighting with his friends, in order to protect himself, the shield thinks of the iron house; For the sake of attacking, Yuspear thought of the muzzle, combined the two, and invented the tank. The second part talks about the invention of the tank to defeat the enemy army on the battlefield and show its might. The third part leads to the invention of the tank, which leads to the truth that "whoever is good at combining the strengths of others will be the winner".

This is part of the text, in history, due to the bitter lesson of the Allies who killed 50,000 people in one day on the Marne, the idea of the tank put forward was composed of a crawler tractor just invented at that time and a steel plate, which was secretly developed with the secret support of Churchill.

In fact, the tank was inspired by the shell, and the hard shell of the tank was invented, but unfortunately it was changed to a spear and shield by later generations.

It was invented by combining the two into one.

It was the inventor who focused the strengths of the spear and shield on the tank, so that it could both (attack) and (defend) and have the best of both worlds.

When two things come together, you can invent something new**, for example:

Combined with airplanes, aircraft carriers were invented.

Together with the rifle, the automatic grenade launcher was invented.

Tables and chairs were combined to invent the all-in-one table and chair.

Printers, scanners, and photocopiers were combined to create the all-in-one printer.

The faucet was combined with the car to invent the fire engine.

Electricity and the guitar were combined to invent the electric guitar.

Airplanes were combined with boats to invent the seaplane.

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