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.
現代物理學認爲宇宙中存在4種力：電磁力、萬有引力、強力和弱力。
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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，物理學家發現弱力在処理物質和反物質是不完全對稱的，此種結果稱爲宇稱不守恒（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.
因爲，這個理論的最終証實，惟賴人們一瞥玻色子W和Z的真容——該理論推斷這兩種粒子攜帶弱相互作用力，就像光子攜帶有電磁力一樣。

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