圈量子引力论是物理学的未来。
量子引力的其它理论，包括弦论和圈量子引力，对新人来说都更难以涉足其中。
Other theories of quantum gravity, including string theory and loop quantum gravity, are far more difficult for newcomers to embrace.
量子引力的其它理论，包括弦论和圈量子引力，对新人来说都更难以涉足其中。
Other theories of quantum gravity, including string theory and loop quantum gravity, are far more difficult for newcomers to embrace.
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