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However, another problem cropped up just one day after the successful fueling demo. Ground teams were unable to flow helium into the rocket's upper stage. Unlike the connections to the core stage, which workers can repair at the launch pad, the umbilical lines leading to the upper stage higher up the rocket are only accessible inside the cavernous Vehicle Assembly Building (VAB) at Kennedy.
换句话说，“天然药物+DDS”是一个逻辑闭环，但是否构成真正的护城河，取决于临床数据能否支撑差异化定价。