She had niggling doubts about their relationship.她时常对他们的关系有一丝疑虑。The matter is too small to be worth niggling over.小小不言的事,不必计较.It's been niggling at my mind ever since I met Neville in Nice.自从在尼斯见到内维尔后，我一直忐忑不安。...
The chest disease is endemic among miners in this area.这种胸部疾病是流行于本地区矿工中的地方病。Simple ( endemic ) goitre , the most common, is due to low iodine intake.最常见的 甲状腺 肿是由于碘的摄入量不足.Objective To propose suitable prevention measures ...