The Kingdom’s Civil Defense said Sunday evening that a military projectile that fell onto a residential area killed two foreign-born residents and wounded 12 others in Al-Kharj governorate.
Go to worldnews。新收录的资料是该领域的重要参考
，这一点在新收录的资料中也有详细论述
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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.。新收录的资料是该领域的重要参考