And sometimes it's a matter of factors that you need to figure out what it is, and maybe it's that there's extra light in the room we don't know about.

而且有时候它是,需要计算的一个因素，有时候这个房间里可能有,我们未知的额外的光。

麻省理工公开课 - 化学原理课程节选

You know, I still play here, and sometimes I umpire here, so it's a great park.

我仍然在这儿踢球，而且有时候在这儿当裁判，所以这是个很棒的公园。

中央公园的时光 - SpeakingMax英语口语达人

For example, if we talk about photons, of course, we also just mean light, sometimes we refer to this as electromagnetic radiation, and there's several ways that you might be asked this in a problem or that you might be asked to answer.

举例来说，如果我们讨论光子，当然我们也叫做光，有时候我们看作是电磁辐射，而且这里有几种方式,你可能会在题目中被问到,或者被提问回答。

麻省理工公开课 - 化学原理课程节选

sometimes it's really hard to, you know, sort of get the idea across.

而且有时候也很难清楚表达我的意思。

教英语 - SpeakingMax英语口语达人

And I think in some cases, it could be a very good investment

而且有时候我觉得这是很好的投资。

关于购买艺术品 - SpeakingMax英语口语达人

and you know, people would ask, some people sometimes ask like,

而且人们会问，有些人有时候问，

圣莫妮卡和洛杉矶 - SpeakingMax英语口语达人

and sometimes she's just a pain in the neck.

而且有时候，她很讨厌。

在公园碰到的母子 - SpeakingMax英语口语达人

and just you know, it's very unstressful sometimes,

而且你知道，有时候很没有压力，

加州万岁 - SpeakingMax英语口语达人

And often, if you want to make a lot of it, you have to think about the thermodynamics of the system, how fast the reactions will go and kinetics, and then whether they'll go, the thermodynamics, and sometimes then you need to adjust the reactions, maybe use a transition metal to make it go better.

这种分子就不能正常工作，而且通常来说,如果你要大量生产一个东西,你必须考虑系统的热力学，反应速率和动力学,还有反应是否会发生，热力学，而且有时候你需要调整反应的发生。

麻省理工公开课 - 化学原理课程节选