1. A weight off my shoulders

放下肩头的重担.

That is a weight off my shoulders. = That is no longer a burden or responsibility to worry about.

那不再是我的责任忧虑了.

例子: Finding a job after three monthes of looking was a huge weight off my shoulders.

经过三个月终于找到了工作,我肩头的重担放下来了.

2. Ace

得满分(得到完美的结果)

I aced it. = I performed perfectly with little trouble.

我得表现,轻易完成.

例子: I didn't ace the test like I thought I did. I actually got ten wrong out of one hundred.

我考满分.实际上90分.

3. All ears

全是耳朵（洗耳恭听）

I am all ears. = Tell me about your trip. I am all ears.

告诉我你的旅行怎么样，我洗耳恭听。