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.