服务速度变慢的原因有：如今菜单上的选择更多了，而且产品本身也更复杂，准备时间更长。

Among the reasons for the slower service, today there are more choices on the menu, and the products themselves are more complex and take longer to prepare.

youdao

第二种抱怨不太常见也更复杂。

Complaints of type 2 are both more rare and more complex.

youdao

你比你所认识的自己更深层也更复杂。

You’re much deeper and complex than you probably realize.

youdao

It's much more varied.It's much more complex.

它更加的多样化，更多彩也更复杂。

耶鲁公开课 - 聆听音乐课程节选

It expands. You change your constraints on your system, you heat it up some more, then you take the heat source away, and you put it back in contact with the atmosphere. And you cool it a little bit, change the constraints, cool it a little bit more, and heat, and you've got a closed cycle engine.

让它与大气接触冷却,改变约束，使它继续冷却，然后又再次加热,这就是循环热机，我们以前也研究过，更复杂的机器。

麻省理工公开课 - 热力学与动力学课程节选