He later acknowledged, however, that it is possible the 16-month timeline could slip if the pace of withdrawal needs to be slowed to ensure troop safety.
NPR: Obama Says His Position On Iraq Is Unchanged
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。