- 现有大量关于第一次世界大战的文献。
There is now extensive literature dealing with the First World War.
- 第一次测量声速是在什么时候?
When did the first measurement of the speed of sound take?
- 你第一次猜得对。
Your first surmise was right.
- 我与她的第一次会面的情景经常出现在我的记忆中。
My first meeting with her often recurs to my memory.
- 这是她第一次怀孕。
This is her first pregnancy.
- 不久以后,他第一次就这一事件发表了公开声明。
Soon afterwards he made his first public statement about the affair.
- 如果我没记错的话,我们第一次相遇是在纽约。
We first met in New York, if my memory serves me.
- 在第一次世界大战中,我祖父驻守在法国北部前线。
Grandfather was in the trenches during the First War.