N5
なか
Definition
inside, in, among, within, center (centre), middle, during, while
N4
れいぼう
Definition
cooling, air-conditioning
N3
つまり
Definition
that is to say, that is, in other words, I mean, in short, in brief, to sum up, ultimately, in the end, in the long run, when all is said and done, what it all comes down to, when you get right down to it, basically, clogging, obstruction, stuffing, ...
N2
つける
Definition
to turn on, to switch on, to light up
N1
このごろ、このころ
Definition
recently, nowadays, these days, now, at present