Turns out, according to Daniel Cook, a historian of childhood consumerism, it was popularised as a marketing trick by clothing manufacturers in the 1930s.
研究儿童消费主义的历史学家丹尼尔·库克认为，这其实是上世纪30年代作为服装制造商的一种营销手段流行起来的。
Letting the cat out of the bag is supposed to stem from a trick played in old markets where buyers were duped when they thought they were buying a Suckling pig.
一般认为，“把猫从袋子里放出来”的说法源自古代集市上的一个把戏：有时，商贩会欺骗买家，在他们购买乳猪的袋子里装一只猫。
I said, as if pulling out a deck of CARDS to do a magic trick. "I do get fan letters."
我问道，好像拿出一副扑克牌准备变戏法一样，“我的确收到书迷来信了，这挺了不起的，对吧？”
Actually, it seems I pulled a trick question out of the mailbag this week, because we don't sneeze in our sleep at all.
现在看来，我好像从邮箱里挑了一个捉弄人的问题，因为我们根本就不会再睡觉时打喷嚏。
The trick to getting the most out of any tool is to know how it works and to use it responsibly.
使工具发挥最大效用的秘诀，就是你要了解它是如何工作的，然后负责任地去运用。
The trick is finding a profitable way to get these crops out of the lab and past convoluted regulations.
如今的关键问题在于找到一个有效益的方法，让这些作物走出实验室，跳出过去的复杂常规。
Letting out all of her fearful thoughts before test time may have done the trick, according to a new study published Thursday in the journal Science.
据周四出版的《科学》杂志中一篇新的研究表明：考前摆脱恐惧心理有利于考试获得成功。
I later learned that it's an old obstetric trick to threaten the mother of twins with a C-section in order to get her to push out the second baby, but Dr. Gold insisted he wasn't playing that game.
之后我才知道这只是手术中的老把戏，用剖腹产来吓唬双胞胎产妇以使她用力产出第二个孩子，金博士坚持说这次可没玩把戏。
The trick is to use their love of novelty to work out what is happening inside their brains: when shown the same things repeatedly, babies' eyes wander; when the scene changes, their gaze returns.
研究婴儿大脑活动的主要方法是通过婴儿偏好新异刺激的方法：当重复呈现相同刺激时婴儿的注意开始漂移，而当新的刺激呈现时，注视点重新回到刺激物上。
It always turns out to be some low-level cheating which almost anyone could get the hang of with a little practice. Same with the three-card trick.
它通常使用一些低级的作弊手法而任何一个人只要稍加练习就能学会，三卡把戏也一样。
And the trick to a puzzle box is there's a simple way to get out but you have to kind of pull on something, some special lever, to make it pop open.
这个谜笼的设计是这样的,只要小猫拉动一个东西,它就能够逃出去，拉动一个特殊的杠杆，迷笼就会打开。
In fact, it seems that the only point in having things stored inside your head is as a sort of party trick to whisk them out to show off in front of colleagues when there is no computer at hand.
事实上，在头脑里储存信息，唯一的用处就是：当手边没有电脑时，可以在同事们面前卖弄一番，这就像一种聚会上常用的花招。
The trick is to not think about it, if you start thinking "Should I talk to her or not?" then you will talk yourself out of it.
当你开始考虑“我是否应该和她聊天的时候”，你要远离这种想法。
And in particular, I'm going to cheat slightly I'm going to use a little bit of abusive mathematics, but I'm going to show you a trick to figure it out.
尤其要说明的是，我会有一点不属实在里面，我会滥用一点数学，但是，我会教会你们这个小把戏的。
One of the best ways to trick your mind is to simply take it out of the equation.
最好的方法之一就是完全剔除掉这个想法。
Some people find that sketching out an outline of major points works to improve their writing, while others find that simply taking time to visualize the final written product does the trick.
有的人会做提纲，罗列要点来提高自己的写作，而有的人则认为直接写出最终稿才会有效。
The trick worked out by Dr DOS Santos and Dr Mayer is how to create capsules a few hundredths of this size.
dosSantos博士和Mayer博士想出来的诀窍就是如何创造跨度仅为过去的百分之几的胶囊。
So the trick is to compare the activity of your typical user with the activity described in the tests in part 1 and 2 of this series, and work out a rough scaling factor.
因此，技巧就在于将典型用户活动与本系列第一、第二部分描述的活动进行对比，并找到一个大致的比例系数。
It is this that allows us to do the trick of printing out the parameter "p" and then passing it to the "rest" function to continue the computation, seen here in the definition of the "Bind" method.
这样话，就可以让我们能取巧打印出参数“p”并接着把它传递给“rest”函数继续进行计算。
One trick: Try asking each participant to write down their vision of the perfect outcome, and then read each piece out loud without identifying the author.
这里有一个办法：试着让每个参与者写下他们眼中最完美的结果，然后把每个人写的大声读出来，但不要点明作者。
For those struggling to transcend mediocrity at work, what's the trick to snap out of it?
对于工作中正在为超越平庸而努力的人，有没有令他们重新振作起来的秘诀？
This is the result of trying a new time management trick every week, for months and months, until I figured out a system for getting the blog posts done.
这是我在每周、一个月又一个月地尝试一种新时间管理方法直到找出一个能将博客写好的制度的产物。
The trick to get out of the well is to stop wailing, and not let the dirt bury you, but to shake it off and take a step up.
走出井谋略是不要停下来等，而是不要让这些泥土掩埋了你，而是抖落它踩在脚下。
The trick to get out of the well is to stop wailing, and not let the dirt bury you, but to shake it off and take a step up.
走出井谋略是不要停下来等，而是不要让这些泥土掩埋了你，而是抖落它踩在脚下。
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