14.She was always on his back, nagging him from morning to night to move to a quieter district.
她总是烦扰他, 从早到晚唠叨不停地要他搬到安静一点的地区去。
15.The multi-beam receiver is also uniquely suited for resolving one of the nagging problems of modern radio-telescopy: screening out radio frequency interference (RFI).