thereat的中文翻译是什么意思

It is rather cold thereat night.

带点厚衣服,那里晚上是很凉的.

And thereat she began to talk quickly and easily upon the subject he had suggested.

于是她便就他提起的话题轻松地谈了开来.

Thereat began a feeble scratching outside, and the pile of books moved as if thrust forward.

话毕,外面响起了微弱的抓的声音, 那堆书也动起来,仿佛有东西要进来了.