Vocabulary consisting only from characters you are able to read
苦労
kurou
troubles, hardshipssuru
加熱
kanecu
heating, application of heatsuru
表す
arawasu
(1)to reveal, to show, to display, (2)to express, (3)to represent, to signify, to stand for, (4)to make widely known godan, jlpt3, verb, vtrans
内
uči
(1)inside/within/ (2)while/ (3)among/amongst/between/(pn,adj-no) (4)we (referring to one's in-group, i.e. company, etc.)/our/ (5)my spouse/(n) (6)(arch) imperial palace grounds/ (7)(arch) emperor/( adj, jlpt4, leda1