Vocabulary consisting only from characters you are able to read
使用中
しようちゅう
busy, in the middle (of)mix
約
やく
(1)approximately/about/(n) (2)promise/ (3)shortening/reduction/simplification/ (4)(ling) contraction (in phonetics)/(P) mix
試作機
しさくき
prototype (e.g. plane)mix