这是我用英文怎么表达？?

这是我所能帮忙做的最起码的事。

It's the least I can do to help.

这是我第五次去美国了。

It's the fifth time that I've been to America.

这是我国历史上的一个新纪元。

It was a new era in the history of our country.

这是我姑姑，她是从加拿大过来的`。

This is my aunt who's over from Canada.

这是我心目中完美的家庭住宅。

It's my ideal of what a family home should be.

这是我所遇到的最好的事。

It's the best thing that has ever happened to me.

这是我确实要走的唯一理由。

That's the only reason I'm actually going.

这是我认为最值得推荐的光盘的清单。

Here's a list of my top CD recommendations.