Vocabulary consisting only from characters you are able to read
二人
futari
two persons, two people, pair, couplejlpt5
人工
jinkou
artificial, manmade, human work, human skill, artificialitymix
上
ue
above, on top of, up, upper part, surfacejlpt5
中
naka
inside, middle, amongjlpt5
土木
doboku
public worksmix