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1·So this is an isothermal expansion.

这是个等温膨胀过程。

2·If I want to compare it with the isothermal expansion, which is sitting here.

我们要将它与，这幅图中的等温线相比较。

3·Q In other words, and irreversible isothermal expansion takes less heat from the hot reservoir than a reversible one does.

不可逆小于q可逆，q, irreversible, is, less, than, q, reversible。，换句话说，不可逆等温膨胀，从高温热源吸收的热量，少于可逆等温膨胀。

4·The power series expansion method is utilized to study the collective behavior in dusty plasma consisting of cold dust particles and two-temperature isothermal ions.

用幂级数展开法研究了具有两种温度绝热离子的冷尘埃等离子体体系的集体行为。