People celebrate the Moon Festival because the harvest season ends.

Przykładowe wyjaśnienia:

autumn - a season when it gets colder

lasts - continues

prepare - make

traditional - famous and known for a long time

end - when it ends

harvest season - a time when farmers collect their crops

sing - make a tune with your voice

poems - short texts, works of art

symbolises - means

beauty - something that is beautiful

lady - young woman

make a wish - 

dreams - what you wish for

come true - become reality