Meanings

untraceable

refreshing breeze and the bright moon

of unknown affiliation

dubious

probe into the truth (of the matter)

thorough investigation

plain and lucid

apologetic (defensive) tone of voice

(both) the bright and dark sides

clear accounting

simple and clear

cheerful and openhearted

beautiful scenery of spring

the point of an argument being unclear

first-to-invent principle (in patent law)

letter of explanation

accountability

to become bright

to dance all night

civilization