请用一个长英语句子解释量子力学是什么
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Quantum mechanics, a fundamental theory in physics, describes the phenomena at the nanoscopic scale, where the action is on the order of the Planck constant, providing a probabilistic framework for the behavior of particles and wavefunctions through principles such as superposition and entanglement, which are foundational to understanding atomic and subatomic systems and underpin modern technologies such as semiconductors, lasers, and quantum computing.
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