"Study at body" are three separate words. "Study" is spelled /ˈstʌdi/ with the main stress on the first syllable. "At" is spelled /æt/ with the vowel sound /æ/. And "body" is spelled /ˈbɒdi/ with the main stress on the second syllable and the vowel sound /ɒ/. Together, these words form a phrase indicating where one is performing academic work: "I like to study at body, it's a quiet and peaceful environment."