但即使人类的记忆很脆弱，易于变化，也不应被低估。

But while human memory is fragile and subject to change, it should not be underestimated.

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疔疮是一种发病迅速，易于变化而危险性较大的急性化脓性疾病。

The deep nail-like boil is one kind of morbidity is rapid, easy to change, but risky big acute suppurative disease.

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但水平连续铸钢系统是一个复杂的控制系统，具有多变量、干扰多、参数易于变化的特点。

But the level casing steel in succession the system is a complicated control system, which have the characteristics of the variable, strong coupling more interfering, parameter easy change more.

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And because there is an explicit relationship between u, delta u, q and w, you can always find the easy way to derive the change in internal energy or the heat or the work.

因为Δu，q和w之间,有明确的关系，一般来说,内能或热或功的变化,易于计算。

麻省理工公开课 - 热力学与动力学课程节选