清华大学说，新核钟能稳定工作
Tsinghua University says its new nuclear clock works stably
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清华大学的人和其他人一起做了一种新钟。清华大学说，这种钟已经能稳定地工作。它叫核钟。
People at Tsinghua University and their partners have made a new kind of clock. Tsinghua University says this clock can now operate stably. It is called a nuclear clock.
核钟用原子核里的变化来计时。原来的原子钟用电子的变化来计时。两种钟用的方法不一样。
A nuclear clock keeps time using changes inside atomic nuclei. Conventional atomic clocks keep time using changes in electrons. The two kinds of clock use different methods.
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