Vocabulary consisting only from characters you are able to read
改善
かいぜん
(1)betterment, improvement, (2)(uk) kaizen (Japanese business philosophy of continuous improvement) suru
真冬
まふゆ
období kolem zimního slunovratu, pravá zimaleda1, toki
航空券
こうくうけん
airline ticket, plane ticket, air ticketmix
使う
つかう
(1)to use (a thing, method, etc.)/to make use of/to put to use/ (2)to use (a person, animal, puppet, etc.)/to employ/to handle/to manage/to manipulate/ (3)to use (time, money, etc.)/to spend/to consu godan, jlpt5, leda1, verb, vtrans