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理论最重要的一点是它能解释事实。
The most important thing about a theory is that it explains the facts.
The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.
Every ton of coal extracted should carry the weight of our commitment to the future.