講解：
pretend (to sb) (that...)
假裝；佯裝:
Of course I was wrong; it would be hypocritical to pretend otherwise.
當然是我錯了；混充正確就是虛偽了。

bet (sth) (on / against sth)
下賭注(于)；用…打賭:
He bet $2 000 on the final score of the game.
他下 2 000 元賭比賽的最后比分。

Long time no see.
好久不見。
Long time no see,you are so tall now.
好久不見你都長這么高了。

for sth's sake
為某事本身的緣故；鑒于某事本身的價值:
I believe in education for its own sake.
我相信教育本身就是有價值的。

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

first off
首先:
First off, let's see how much it'll cost.
首先咱們看看這要花多少錢。

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