to move forward
Our troops made an advance against the enemy.
aviator
a pilot of a plane
The aviator had a hard time flying through the thunderstorm.
battle
a violent fight between two or more groups of armies or people that is usually part of a broader conflict
The two knights fought each other in a battle.
commonly
in an ordinary manner
We commonly go to church on Sunday morning.
communicate
to express information by writing, speaking or making gestures
Even if it's the same language, it can still be difficult to communicate efficiently.
enemy
someone who is opposed to another; someone who tries to harm another
I hate him. He is my enemy.
improve
to make something better
I got a B last week and a B+ today. My grades improved.
protect
(usually followed by "against" or "from" ) to defend against harm or danger
Soldiers can protect themselves with a tank.
submarine
a type of ship that can travel both above and below the surface of the sea submarines are boats that move under water.
troop
a group of soldiers, especially horse; an organized group
She was the only soldier from her troop to survive. The rest were killed in the battle.
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