1. a moment later 一会儿，以后

 

My father said he would be out for half an hour, but a moment later, he was back.

A moment later, the farmers saw another cloud coming towards them.

 

moment 指很短语的时间，还有下面一些用法：

 

In a moment he was gone.

She stared at him a moment, then turned away.

Stop for one moment and think about it.

Im moments, I was asleep once more.

 

2. a variety of , varieties of (同类中的)各种各样的

 

它可用于不可数名词或可数名词。

 

A variety of old furniture was sold.

He left here for a variety of reasons.

The island offers such a wide variety of scenery and wildlife.

 

varieties of 后的名词，可用单数也可用复数形式，但谓语用复数。

 

There are varieties of stamps on the market.

There are varieties of water turbine on the market.

 

3. above all, first of all, in the first place 首先，特别是

 

above all 的意思是“首先”，但还可副词，有“特别是”意思。

 

He longs above all to see his wife.

I believe you will succeed, but above all, you must believe in yourself.

 

first of all, in the first place 等也有“首先”的意思，但主要用于列举事物，说明该事物首先发生。

 

First of all, I'd like to say something about our tour.

I'm for the plan. In the first place, the plan is practical; and in the second place, it saves time.