weak force

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Modern physics thinks that there are 4 kinds of force in the universe: electromagnetic force, gravitation, strong force and weak force.
现代物理学认为宇宙中存在4种力：电磁力、万有引力、强力和弱力。
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In 1964, physicists found that the weak force is not quite symmetrical in its dealings with matter and antimatter, resulting in something known as CP violation【3】.
1964年，物理学家发现弱力在处理物质和反物质是不完全对称的，此种结果称为宇称不守恒（CP violation）。
The theory’s vindication would come only with a glimpse of W and Z bosons—particles which, it posited, carried the weak force, just as photons carried the electromagnetic one.
因为，这个理论的最终证实，惟赖人们一瞥玻色子W和Z的真容——该理论推断这两种粒子携带弱相互作用力，就像光子携带有电磁力一样。

The remaining force was too weak to defend Atlanta.
The Confederate force was weak.
Since Ethiopia's withdrawal in January, al-Shabab began cooperating with another Islamist group called Hisbul Islam to topple the U.N.-backed, but weak transitional federal government, and to force more than 5,000 AU peacekeepers from Uganda and Burundi to abandon their mission.

The linchpin of the model is the underlying unity of two of the three forces: electromagnetism and the weak nuclear force.
ECONOMIST: Particle physics makes sense, but it assumes too much

a reaction between particles that causes some radioactive substances to break down

interaction an interaction between elementary particles that is responsible for certain decay processes, operates at distances less than about 1015 metres, and is 1012 times weaker than the strong interaction. The weak interaction and electromagnetic interactions are now described by the unifying electroweak theory (Also called weak nuclear interaction, weak nuclear force) &rarrsee interact ,electroweak interaction