曲线是在理想条件下给出的。

The curves are given for idealized conditions.

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即使在理想条件下，浮游植物的存活时间也只有1、2天。

Even in ideal conditions an individual phytoplankton only lives for about a day or two.

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在理想条件下，可以测试所有的单元，然后采用平均数。

In ideal circumstances, you measure all the cells and take the average.

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And again there, too, you saw an experimental result you were presented with that says, well at least to the extent that it could be measured, it was obviously getting very small.

再一次，你看到了一个,你经知道的实结果，至少在实验测量的范围内，对理想气体条件下的气体这一项很小。

麻省理工公开课 - 热力学与动力学课程节选

Somehow, if you could manufacture a really smooth frictionless surface, that if you took a hockey puck or something and an air cushion and you give it a push, in some idealized world, it'll travel forever.

如果你制造一个绝对光滑无摩擦的表面,然后在上面放个冰球或者别的什么,或者气垫,然后推它一下,在理想条件下,它会永远运动下去

耶鲁公开课 - 基础物理课程节选