Chinese New Year！

4.  三十 / 除夕

Chinese New Year's Eve     

or    the New Year's Eve    

前面介词用 “on"   on Chinese New Year's Eve

On the New Year's Eve, a very important tradition is the New Year's Eve Dinner. 

除夕一个非常重要的传统是年夜饭。

tradition   传统

the New Year's Eve Dinner   年夜饭

5.   放烟花放爆竹

fireworks      烟花

firecrackers    爆竹 

set off fireworks   燃放烟花 

On Chinese New Year's Eve, people set off a lot of fireworks to send off the past and welcome the new.  除夕时，人们燃放好多的烟花辞旧迎新。

send off the past and welcome the new    辞旧迎新