The accuracy of scientific observations and calculations is always at the mercy of the scientist's timekeeping methods.

科学观测和计算的准确性，总是受制于科学家的计时方法。

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Everybody knows that women and men communicate differently, and here are some observations from the scientific community that will enlighten you as to how and why.

每个人都知道，男性和女性的沟通方式不同，下面一些科学界的观察能够帮助你去思考这怎么回事和为什么。

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Radar observations already have extensive military, civil, and scientific applications.

雷达观测已经广泛用于军事，民事和科学。

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But it is a scientific theory based on repeated observations, experiments,measurements and discoveries.

VOA: special.2009.12.01

In common terms, a lack of direct observations and a lack of agreement in scientific studies means such assertions amount to unproven speculation rather than fact.

FORBES: The UN Pulls Back From Its Extreme Weather Claims

The satellite is intended for Earth observations to assist with scientific research, and will be constructed by Astrium.

FORBES: Arianespace To Launch Vietnamese Satellite

It was this sort of careful science starting with a scientific hypothesis, following it up with observations in the field and ending with clinical trials which proved that circumcision protects against infection.

ECONOMIST: The XVIIth International AIDS Conference