At the start of the 1800s, a new artillery shell appeared on the battlefields of Europe. It was the brainchild of an English officer who had spent 30 years perfecting it.

十九世纪初，欧洲战场上出现了一种新炮弹，那是英国一名军官发明的，花了他三十年研制，精益求精。

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If you took a 15 inch artillery shell moving at the velocity it typically goes at, and take that amount of kinetic energy versus the resistive capacity of a sheet of tissue paper, that's the scale that we're looking at here.

如果你有1个15英寸的炮弹,按照经典的速度移动，会消耗大量的动能,抵抗来自于一张薄纸的阻力，这就是我们在这儿看到的尺度。

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On 10 June, Khaled Al-Bakir, a citizen journalist also known as Abu Sliman, 30, was killed by an artillery shell in the town of Al-Qassir, south of Homs.

UNESCO: Director-General condemns continued killing of Syrian citizen journalists | United Nations Educational, Scientific and Cultural Organization

Also on Tuesday, an artillery shell struck inside a second U.N. school in the same town, but the boys' prep school was empty at the time, UNRWA director John Ging said.

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Every few minutes another artillery shell is launched.

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