（一）船舶所有人的受雇人或者代理人；
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.
。新收录的资料对此有专业解读
Columbia was unable to withstand the fiery re-entry into the Earth's atmosphere, disintegrating as the world watched on in horror.
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