Ground based attempts to detect gravitational waves on Earth have so far been unsuccessful and can only look for gravitational waves with relatively highfrequencies.
地基检测器曾尝试在地球上探测引力波,但至今尚未成功,而且其只能检测频率相当高的引力波。
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These highfrequencies correspond to the rotation speeds of centrifuges; America tightly controls the export of frequency converter drives able to operate at frequencies above 600 Hz.