For isothermal expansion, that means that delta u does not change, but delta q is equal to delta w?

在等温过程中，是不是内能不变，Δq等于Δw？

麻省理工公开课 - 热力学与动力学课程节选

It's well insulated. Heat is not going in or out adiabatic. q is equal to zero.

绝热性很好，热量不会变化,是绝热的，Q等于零。

麻省理工公开课 - 热力学与动力学课程节选