Imagine that you have several lego parts and you made it like the blades of a jet engine (compressor). Drop something on it and it will break.
A jet engine contains a lot of blades ( compressors, turbines etc ). Now imagine building several lego blades and putting them side by side. Drop something on it and your blades would break and the pieces + bird going into the engine itself. And at the end your engine gets damaged
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