Her days now revolved round cooking, washing up, nappies, feeds; lifting the kettle to the gas stove, setting her skirt over a chair to have it without creases for the morning.

她的生活现在围绕着做饭，洗碗，换尿布和喂食；把水壶放到煤气灶旁，把裙子搭在椅子上，这样早上就不会有褶皱了。

This was an explanation of why each time the planet Mercury revolves round the sun, it gets a bit closer to the sun at the nearest point (its perihelion).

这解释了为什么每次水星绕太阳旋转时，它都会在最近的点（其近日点）更接近太阳。