She seemed really relaxed, and definitely interested in me.它看起来很放松而且对我真的很有兴趣

interest in:对 ... 有兴趣

I have no interest in pop music.

我对流行音乐不感兴趣。

I can't work up any interest in this book.

我对这本书提不起任何兴趣。

just being inquisitive I think, and having a bit of fun.很好奇吧，我想，同时又玩得很开心

a bit of:一点儿的

The party was a bit of a damp squib.

这次聚会有些扫兴。

I am always a bit of a duffer at maths.

我在数学方面总是有点笨。

It's not diving down for very long, maybe a couple of minutes.潜下去的时间不长，可能才两，三分钟

a couple of:两个, 几个

Give the bottle a couple of shakes before pouring the juice.

倒果汁前，先把瓶子摇几下。

I saw a couple of men get out.

我看见有几个人出去了。

just keeping an eye on it.就近看着它

keep an eye on:留意； 照看

Please keep an eye on the children.

请照看一下孩子们。

He asked his neighbour to keep an eye on his house.

他请邻居照看他的房子。