NIST scientists use lasers that emit about 1 billion pulses per second.
NIST的科學(xué)家們用激光器每秒發(fā)射約十億次脈沖.
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NIST kicked off the selection process in September 1997.
NIST在1997年9月開始這個選擇過程.
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Currently, most customers either send or hand carry artifacts to NIST for calibration.
現(xiàn)在, 多數(shù)客戶要么郵寄要么隨身攜帶制造品去NIST校準.
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