👉 The "let fluid" refers to a type of liquid that can flow or move freely, often associated with biological systems or materials science. In a biological context, it can describe the fluid within cells, such as cytoplasm, which allows for the movement of organelles and molecules. In materials science, "let fluid" might describe a synthetic or engineered liquid that exhibits fluid-like behavior, such as self-healing properties or the ability to change shape under certain conditions. Essentially, it's any liquid that can move and adapt in a way that is useful or characteristic of its environment, whether it's within a cell or in a lab setting.