讲解：
pretend (to sb) (that...)
假装；佯装:
Of course I was wrong; it would be hypocritical to pretend otherwise.
当然是我错了；混充正确就是虚伪了。

bet (sth) (on / against sth)
下赌注(于)；用…打赌:
He bet $2 000 on the final score of the game.
他下 2 000 元赌比赛的最后比分。

Long time no see.
好久不见。
Long time no see,you are so tall now.
好久不见你都长这么高了。

for sth's sake
为某事本身的缘故；鉴于某事本身的价值:
I believe in education for its own sake.
我相信教育本身就是有价值的。

speak of / about sth / sb
提起；讲述:
Speaking of travelling (= referring back to a subject just mentioned), are you going anywhere exciting this year?
说到旅游,你今年要去什么好玩的地方吗？

first off
首先:
First off, let's see how much it'll cost.
首先咱们看看这要花多少钱。

on purpose
故意；有意地:
He did it on purpose, knowing it would annoy her.
他明知会激怒她,却故意那么做。