据宣传她要发表题为“中国—昨天和今天”的演讲。

She was billed to speak on 'China—Yesterday and Today'.

《牛津词典》

昨天还是学生，今天成了雇员。

Yesterday's students are today's employees.

《牛津词典》

“今天比昨天冷多了。”他漫不经心地说。

'It's much colder than yesterday,' he remarked casually.

《牛津词典》

If the stock went up yesterday, it's more likely to go up today, than if it didn't go up yesterday.

如果股票昨天涨了，今天涨的可能性也就更大，如果昨天没涨今天也不大可能会涨。

麻省理工公开课 - 计算机科学及编程导论课程节选

since all the information is in the current price, you don't have to worry about whether it went up or down yesterday, to decide what it's going to do today.

因为当前价格代表了所有信息，你就不需要去考虑昨天股价,是涨了还是跌了，再去判断它今天的价格会怎么变化。

麻省理工公开课 - 计算机科学及编程导论课程节选

So let me start off with-- is this the first day of shopping or was it yesterday?

首先我想问一下,第一次的试听课是今天还是昨天

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选