Sunspots are caused by irruptions into its surface of the sun's deeper magnetism.

太阳黑子是由入侵活动进入太阳深层磁性表面造成的。

Over the period which Dr Penn and Dr Livingston analysed, the average magnetic strength of the irruptions has declined.

佩恩和利文斯顿博士分析表明，入侵活动的平均磁场强度已有所下降。

But, there was no loud irruption into the courtyard, as he had expected, and he heard the gate clash again, and all was quiet.

只是，院子里并没有像他预料的那样大声闯入，他又听到了大门的撞击声，一切归于平静。

The sun shone brightly; the distance he had to travel was considerable, and he remembered with dismay that the General's sudden irruption had prevented Lady Vandeleur from giving him money for a cab.

阳光明媚；他必须走很远的路，他沮丧地想起将军的突然闯入导致范德勒夫人没给他钱叫出租车。