可以将快速模式视为低级的3d功能实现方式，保留模式显示3d图像的方式更为抽象，令人感觉也更要舒服一些。

You can imagine immediate mode as the low-level access to 3d functions, and retained mode as a more abstract, but also more comfortable, way of displaying 3d graphics.

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在第三章首先从低级的视觉感觉和高级的视觉心理角度，深入地描述了人眼的视觉特性。

In Chap 3 people eyes' visual characteristics are described accurately and deeply from low-class visual feeling to high-class visual psychology.

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纽约的派对现场更让人感觉低级庸俗，随处可见年轻美女和老男人勾肩搭背。

And the scenes from New York venues that have hosted the get-togethers , showing pretty young women hanging off the arms off much older men only add to the sleaziness factor.

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If it's possible, use animals that don't feel pain, or use lower forms of life.

如果可以的话，请使用那些感觉不到疼痛的动物，或者用低级生物。

需要动物实验吗？ - SpeakingMax英语口语达人