“Second's Pendulum”的概念、定义、翻译、参考文献-科学参考

单词	Second's Pendulum
释义	Second's Pendulum A simple pendulum whose time period on the surface of earth is 2 seconds.
随便看	Uncaria tomentosa extract Uncertainty Principle unclassified variant uncontrolled study unconventional cancer treatments underactive thyroid undescended testicles undifferentiated unguent Uniform Acceleration Uniform Circular Motion uniformly-labeled [U-13C] glucose Uniform Speed Uniform Velocity unilateral unilateral salpingo-oophorectomy uninformative Uniphyl United States Preventive Services Task Force Unituxin Unituxin Universal law of gravitation Universe Unpolarized light Unpolarized light

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