Why must portholes of naval ships be round?

舰艇舷窗为什么都是圆的？

The large galley has portholes giving a view of the impeccable engine room.

艺术品摆设区巨大的舷窗设置可让游客观看机房的操作实景。

Out the portholes, Europe slipped over the horizon and the Carthage hit open water.

舷窗外，迦太基号拨开水浪，欧洲逐渐消失在地平线。

The ISS portholes and Windows also provide a vital tool for studying our planet.

国际空间站的窗户还是我们研究自己星球的一个重要工具。

A hotel should be comfortable inside, and it will be possible to look at the Earth through large portholes.

旅馆应该是很舒适的，通过大大的舷窗可以看到地球。