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No spine animal, or無脊椎動物in chinese, is a phrase used by John Mak in LSC to tell others they have a curved sitting posture. People getting told they are No spine animal might find it annoying, other students will laugh although they have no idea what is No spine animal.
Student A: sits in a poor posture
Mak: You are 無脊椎動物!!
Students: Ha ha!
No spine animal(Mak)