It has a hat because it's a unit vector, and t because it's tangent.

这上面有一个帽子表示它是单位矢量，T表示它是切线。

youdao

Most people recognize the benefits of individuality, but the fact is t hat personal economic success requires conformity.

大多数人只意识到个性化的益处，但实际上个人的经济成功需要一致性。

youdao

T hat is the issue that will continue in this country when these poor tongues of Judge Douglas and myself are silent. It is the eternal struggle between right and wrong .

“奴隶制问题是一个真正的问题，”他说，“ 这个问题将在我们国家继续下去，这个问题将使道格拉斯理屈辞穷，而我则保持沉默，这个问题将永远是正确与错误的斗争。

youdao

If you ever go, just don't forget your cowboy hat.

VOA: special.2009.02.16

There are people who don't believe that, and instead argue t hat there is this notion called momentum.

有的人不相信这种说法，并且说,有一个叫做股票势头投资的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

If we weren't so pressed for time, I kinda wanna see how long we could get away with this before it gets awkward, but that, in fact, is an infinite loop t hat's hopefully deliberate.

如果有时间，我想看看,我们需要花多长时间解决这一问题，事实上，它是我故意,使用的无穷循环。

哈佛公开课 - 计算机科学课程节选

He was wearing a baseball hat, t-shirt and jeans.

BBC: NEWS | Europe | An enduring hero to French immigrants

"I won't make a hat so big you can't get through the door to the facilities, " said Ms. Singer, the Lexington, Ky.

WSJ: Hatmaker Polly Singer | 60 Seconds With

What was accepted as growth, is more moderate, more geared to a value holding t hat requires free cash flow to be used in repurchasing shares and dividends.

FORBES: The Great Stagnation In Broadly Owned Stock Groups