The drill bit Jia Yan uses in his work is tiny and thin and can hardly be seen clearly by the naked eye. Even the slightest carelessness may cause the drill bit to break. [Photo by Dong Ning/China.org.cn]
Jia Yan, 52, is the chief technician of China Aerospace Science and Industry Corporation whose job is to produce and install a critical part of missiles commonly called the "eyes."
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