?跪着
... fall/go on one's knee 下跪 on one's knee 跪着，哀求，筋疲力尽 knock at 敲 ...
跪下
单膝跪下
One day,he was sitting on his father's knee.
VOA : special.2009.02.21
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。