Science has shown us through measurement, observation and experimentation that there are four forces in the Universe: electromagnetism, strong interaction, weak interaction and gravitation.

科学早就通过测量、观察和实验告诉我们宇宙中有四种力：电磁力、强相互作用力、弱相互作用力和万有引力。

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Modern science is based on observation on experiment, and on measurement.

现代科学是建立在观察、实验和度量的基础上的。

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The universal problems in the martial arts pliancy diathesis of college students are discussed, and the reasons are analyzed via observation and measurement.

通过观察和测量，分析当今大学生武术柔韧素质方面存在的问题，及形成的原因。

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This observation suggests an idealized measurement construct.

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While there are many heart rate apps available, Inner Balance is monitoring heart rate variability (HRV) - a measurement of beat-to-beat changes that occur within heart rhythms and a sophisticated and highly sensitive observation of emotional fluctuations.

ENGADGET: HeartMath unveils Inner Balance iOS app and sensor for managing stress, clearing the mind