准【zhǔn】
1. allow; grant; permit 2. standard; norm; accurate 3. bet your boots
[动]1、许可;同意 [形]2、正确;精确 [副]3、一定;有把握

我的房东说这里不准养宠物!
My landlord says no pets are allowed here!

他的投篮很准。
He's got a great shot.

这场比赛实力悬殊,我们队准赢。
It is a one-sided game. Our team is certainly going to win.
准备【zhǔn bèi】
1. prepare; get ready 2. intend; plan 3. preparation
[动]1、预先安排或谋划 2、打算 [名]3、事前该做的安排

高考临近,所有考生都在积极准备。
All candidates are preparing for the college entrance exam.

放假后我准备去云南旅行。
I plan to travel in Yunnan Province during the vacation.

大家要我在大会发言,但我一点准备都没有。
I was asked to make a speech at the conference, but I was totally unprepared.