Then he yelled really loud, "Now pull, Fred, pull hard."

接着他大声的叫到，“就是现在，拉，弗莱德，使劲拉。”

youdao

Muscles will only contract forcefully a certain number of times before they refuse to pull hard again.

肌肉在强力收缩一定次数之后将无法再继续用力的拉缩。

youdao

Don't pull so hard or the handle will come off.

别太使劲拉，不然把手会脱落。

《牛津词典》

That is,this kind of pull-yourself-up-by-your-bootstraps, that with enough determination and hard work that you can transcend limitations of money or class or gender.

VOA: special.2010.03.08

It's a little bit easier to pull the ball hard then it is to hit the ball to the opposite field. Yes?

从另一侧击球的话,更容易打出大力球,你还有什么想法

耶鲁公开课 - 博弈论课程节选

Now, to some extent, similarity is hard to pull apart from proximity.

某种程度上，相似性和邻近性是很难区分的。

耶鲁公开课 - 心理学导论课程节选

First, a wide open field of Republican contenders will likely pull hard right, alienating independents.

FORBES: 2012 Won't be End of the World for Obama

She must pull hard enough to create change, without ripping apart morale.

FORBES: All Carly, all the time

Or you can just grab whatever part of the appendix is visible and pull really hard.

NEWYORKER: Personal Best