对放射性核素的需求以及用于影像学核素种类都有了飞速增长，从而使生产出现了滞后。
Demand and the variety of imaging agents available have increased drastically, making it difficult to keep up with production.
对放射性核素的需求以及用于影像学核素种类都有了飞速增长，从而使生产出现了滞后。
Demand and the variety of imaging agents available have increased drastically, making it difficult to keep up with production.
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