Conclusions:( 1) Using the design method of block shielding faciocervical portals at isocentre, the individual portals can be designed according to the malignant invading ranges.

结论：（ 1）等中心面颈联合野设野原则可根据鼻咽癌侵犯的范围做个体化放疗设计。

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Shielding that would completely block those rays would be "meters thick" and too heavy to be used aboard a spacecraft, said Eddie Semones, a radiation health expert at NASA's Johnson Space Flight Center.

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