But you may ask: Is it the butter that plays a role?
但你可能会问：是黄油起了作用吗？
Can you talk a bit about how history plays a role in this project?
你能谈谈历史在这个项目中发挥的作用吗？
I'm still trying to work out a role for you, so hang on for one sec.
我还在试着给你找个角色，所以等一下。
In the first two experiments, either the butter or the letter "B" plays a role.
在前两个实验中，黄油或字母“B”起了作用。
A new study suggested that our short-term memory also may play a role in appetite.
一项新的研究表明，我们的短期记忆也可能对食欲产生作用。
I realize we're supposed to research food-born bacteria, but food packaging must play a role in all of that, right?
我意识到我们应该研究食物糜烂后滋生的细菌，但是食物包装应该起到了很大的作用，对吧？
Still, some analysts say that there's a role for doctors to play in cost analysis because not many others are doing so.
不过，一些分析人士说，医生在成本分析中可以发挥作用，因为并不是很多人正在这么做。
Because these things are unpaired, we have already seen how unpaired electrons play a role in the Stern-Gerlach experiment.
因为这些事物都是未成对的，我们已经发现在 Stern-Gerlach实验中，未成对电子扮演怎样一个角色了。
In Dirt, Courteney Cox played a role completely different from her Friends character Monica, but the show was canceled over poor ratings.
在《流言》中，柯特妮·考克斯扮演的角色和她在《老友记》中扮演的莫妮卡完全不同。但这部电视剧因收视率低而被取消了。
I suspect that some experts in the field will be keen to address alternative explanations, such as unassessed variables playing a role in the wellbeing decline.
我怀疑该领域的一些专家会热衷于寻找其他解释，比如未评估的变量在幸福感下降中发挥的作用。
I suspect that some experts in the field will be keen to address alternative explanations, such as unassessed variables playing a role in the well-being decline.
我怀疑，该领域的一些专家将热衷于作出其他解释，比如在幸福感下降中发挥作用的未评估变量。
First, they explain that if a given variable is playing a role in affecting wellbeing then we should expect any change in that variable to correlate with the observed changes in wellbeing.
首先，他们解释说，如果一个给定的变量在影响幸福感方面发挥了作用，那么我们应该预期该变量的任何变化都与所观察到的幸福感变化相关。
The child's same-sex parent acts as a role model.
孩子的同性家长是孩子效仿的榜样。
She would only play a role if she could identify with the character.
她只愿扮演自己认同的人物角色。
With a role in the indie film "Happiness," her career is now swimming along.
在独立制作的影片《幸福》中扮演角色之后，她的事业现在进展得非常顺利。
Various environmental factors may play a role.
各种环境因素也可能会起作用。
She is not just a role model, but someone I love.
她不仅是一个榜样，还是我爱的人。
I'll continue to play a role in passing the ancient skill on.
我将继续发挥作用，将这一古老的技能传承下去。
How exactly the chemical plays a role still remains a mystery.
这种化学物质究竟是如何发挥作用的仍然是一个谜。
Many people are playing a role in saving the earth on Earth Day.
许多人都能在地球日为拯救地球奉献一份力量。
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