Quantum theory dictates that a very tiny thing can absorb energy only in discrete amounts, can never sit perfectly still, and can literally be in two places at once.
量子理论决定了每个微小物体只能吸收不连续的能量，且不能保持完美的静止，甚至能同时出现在两个地方。
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It's all because of the fact that the energy levels are discrete, quantized levels, with gaps in between them.