宇宙冒険についての可愛い小さな本を読み終えたばかりだよ

Meaning: i just finished reading a cute little book about adventures in space

宇宙: universe, space, cosmos, outer space, cosmic, aerospace
冒険: venture, adventure, adventurous, risk
に: in, to, on, at, into, upon
つい: about, just, quite, accidentally, eventually, inevitably, inadvertently, unconsciously, unintentionally
て: the, it, have
の: to, of
可愛い: cute, pretty, lovely, adorable, small, tiny, charming, dear, precious, darling
小さな: small, little, tiny, minor, petite
本: book, this, main, present, tome, volume, origin, principal
を: o, the, to, wo
読み: read, reading, pronunciation, readable, readings, readability
終える: finish, complete, end, cease, terminate
た: the, was, ta, da, other
ばかり: just, only, always, getting, approximately, constantly, merely
だ: is, be, are, am, it is, seems
よ: the, yo, ll