关键词
If you include vaginal deliveries, more than half of all pregnant women receive this type of medication to reduce pain during labor and delivery.
CNN: Can C-section anesthetic lead to low back pain?
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。