One is that he observed when people were machining cannon barrels, a lot of heat was generated, and there was a lot of work done.

第一种说法说焦耳发现,制作加农炮筒时，会产生大量的热，同时这中间有大量的做功。

麻省理工公开课 - 热力学与动力学课程节选

Other one says, maximize the time of flight and you point a cannon like this.

另一种是,让飞行时间最长,像这样进行瞄准

耶鲁公开课 - 基础物理课程节选

He had a passion for fireworks, explosives, cannon fire.

对烟火,炸药,大炮情有独钟

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After the French Revolution and Napoleon, and Napoleon makes peace with the church, there is,all of a sudden, a revival with people forming religious confraternities, of people paying to rebuild churches that have been vandalized during the Revolution, where they're melting down church bells to use as cannon and things like that.

在法国大革命和拿破仑时代,与教会达成和解协议之后,突然间,出现了宗教团体的复兴,人们斥资重建那些,在大革命中被肆意毁坏的教堂,当时人们把教堂大钟熔化了,去造大炮之类的东西

耶鲁公开课 - 1871年后的法国课程节选

Then it lands on your foot, because assuming the cannon is at zero height, the cannonball certainly comes out towards the enemy, but has no time of flight.

然后它就会落在你的脚边,因为假设大炮的高度为 0,炮弹笔直地出膛打向敌人,却没有时间飞行

耶鲁公开课 - 基础物理课程节选

Imagine you got this monster cannon to fire things.

设想你有一门火力强劲的大炮发射炮弹

耶鲁公开课 - 基础物理课程节选

But if you're going to have a big old fort, and you're going to have lots of cannon that you hope to use against your craven, reptile enemies that would want to get in your way, you've got to have people to try out the cannon.

如果你想攻占一个大型的旧式堡垒,你必须要有很多大炮,来对付那些缩在城堡中的敌人,还需要很多士兵来操纵这些大炮

耶鲁公开课 - 欧洲文明课程节选