He was detected in the act of stealing.他在偷窃时被当场发觉.Ken was in the act of paying his bill when Neil came up behind him.当尼尔从后面走过来时，肯正在付账。He was caught in the act of stealing the sweets.他正在偷糖时被抓住了....
多节瘤的老橡树a gnarled old oak tree恶性神经节瘤是一非常少见的实体瘤.Summary of Background Data . Malignant paragangliomas are a very rare entity.大部分副神经节瘤的首选治疗方式是外科手术切除.The treatment of choice is often surgical resection for most paraganglioma...
这四枚新邮票是为了纪念英国天文协会成立100周年而发行的。The four new stamps mark the 100th anniversary of the British Astronomical Association.在历史的年代数目和天文年代数目之间存在差别.There are differences between historical and astronomical numbering of years.数学材料是...