地球科学
四分区
Caesarean sections have risen steadily since the mid-1990s and by 2011 accounted for a quarter of all births in Wales.
BBC: Midwife and pregnant woman
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。