1

自由

zìyóu

freedom; liberty free; unrestricted

=2

的

de

of; ~'s (possessive particle) (used after an attribute when it modifies a noun) (used at the end of a declarative sentence for emphasis) (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂儿的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one") also pr. dì or di in poetry and songs

=2

的

dī

a taxi; a cab (abbr. for 的士 dīshì)

=2

的

dí

really and truly

=2

的

dì

(bound form) bull's-eye; target

3

本质

běnzhì

essence nature innate character intrinsic quality

4

就是

jiùshì

exactly; precisely only; simply; just (used correlatively with 也 yě) even; even if

5

数学

shùxué

mathematics