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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The findings confirm an earlier observation by a team of astronomers, making a strong case that the Milky Way has two major spiral arms, a common structure for galaxies with bars.

此发现证实了一个天文学家小组先前获得的观察：银河系有两条主要的螺旋臂，是一个普通中心带有横条的星系结构。

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Through experiments, we can foster students sharp observation ability, deliberate thought ability, strong practical ability and creation ability.

通过实验可以培养学员敏锐的观察能力，缜密的思维能力，较强的动手能力和创造能力。

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Brahimi said violence must stop and "strong observation" by a peacekeeping mission would be key.

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