colors := ["red", "green", "blue"];
Protons can penetrate up to 30 centimeters, reaching deep-seated tumors. But the delivery of protons in a continuous beam limits the dose rates. Also, proton systems are far larger and more expensive than, say, X-ray machines, which will likely constrain their availability to specialized centers.
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近年来，国家占补改革的核心，是建立省域耕地总量动态平衡为核心的机制，并强化“以补定占”：把省域内稳定利用耕地的净增加量，作为下年度非农建设允许占用耕地规模的上限，同时明确要统筹非农建设与农用地内部调整对耕地的占有需求。
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