Show off: to try to impress others by talking about your abilities, possessions, etc. 炫耀自己;賣弄自己
He's just showing off because that girl he likes is here.
他不過是在表現自己,因為他喜歡的那個姑娘在場.
Bear in mind: 記住
Bear in mind that you'll have to practice economy.
記住要厲行節約.