大爷的英文：
(informal) father's older brother; elder uncle

参考例句：

Then we can devise an efficacious prescription and submit it to the discretion of His Lordship.
"再将这些日子的病势讲一讲,大家斟酌一个方儿,可用不可用,那时大爷再定夺."

He let them abuse us and actually encouraged them to beat us.
"瑞大爷反倒派我们的不是,听着人家骂我们"

Are you related to Uncle Xu of our village?
你和我们村的徐大爷是亲戚吗？

All the aristocracy of the plow ate at Maitre Jourdians
所有富农都在约丹大爷开的酒店用膳。

"ay," said Grandfer Gantle, somewhat subdued in spirit
“唉，”阚特大爷说，只见他的兴头未免去了好些。

informal是什么意思：
adj. 非正式的；口语体的，通俗的；不拘礼节的

Informed judgement.
有事实根据的判断。

This is an informal expression.
这是一种非正式表达法。

This is an informal word.
这是一种口语用语。

father是什么意思：
n. 父亲；先辈；创始人；神父
v. 成为父亲

Pilgrim Fathers
ph.1. (英国1620年前到达北美洲的)清教徒前辈移民

Einstein fathered relativity.
爱因斯坦创立了相对论。

My father was a man of determination.
我父亲是一个果断的人。

older是什么意思：
adj. old的形容词比较级；年长的

The older the wiser.
人老智慧多(姜还是老的辣)。

Older and wiser
越老越聪明

If you were older you might understand.
假如你年龄再大一点，你就会理解了。