改性后超稳Y型分子筛的晶体结构热稳定性增加，脉冲微反试验的正已烷裂解活性下降而烯烃选择性得到提高。
The thermal stability ofthe crystal structure of modified USY zeolite is increased, and n-hexane cracking activity ina pulse micro-reactor is decreased, while the olefin selectivity is increased.
AEBB - 2000加速器是一部特殊的设备，它能实现高能量的反平行电子-正电子束试验。
The AEBB-2000 accelerator is a unique facility for carrying out experiments with anti-parallel electron-positron beams of high energies.
五角大楼官员声称，美国最后一片反卫星试验碎片在2006年落回地球。
The last piece of American ASAT debris fell back to Earth in 2006, say Pentagon officials.
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