all bets are off

(informal)the outcome of a situation is unpredictable

(非正式)世事難料

bet the farm

(N. Amer. informal)risk everything that one owns on a bet, investment, or enterprise

(北美，非正式)（在賭博、投資或風險事業(yè)上）孤注一擲；破釜沉舟

this isn't a great time to bet the farm on the Internet.

現(xiàn)在不是在因特網(wǎng)上孤注一擲的有利時機。

don't (或 wouldn't) bet on it

(informal)used to express doubt about an assertion or situation

(非正式)這拿不準

he may be a suitable companion—but don't bet on it.

他可能會是個合適的同伴——但這也難說。

want to bet?

(informal)used to express vigorous disagreement with a confident assertion

(非正式)敢打賭嗎？（用于表示強烈不同意某種說法）

‘You can't be with me every moment.’ ‘Want to bet?’.

“你不可能時刻都和我在一起。"“打不打賭？"。

you bet

(informal)you may be sure; certainly

(非正式)你放心；當然，一定

‘Would you like this piece of pie?’ ‘You bet!’.

“你想吃這塊餡餅嗎？"“當然！"。

you bet【非正式用語】

Of course; surely.

當然；的確