The system was clearly not functioning smoothly or transparently.该系统显然运行并不顺畅，也不明晰。The bolt slotted smoothly into place.插销很容易就插上了.Soon they found their scientific reseaches were not progressing smoothly.不久他们发现他们的科学研究工作进展得...
The dogs are always rubbing against the wall and making dirty marks.那些狗老是往墙上蹭，留下了斑斑污迹。She began rubbing out the pencilled marks in the margin.她开始擦掉空白处的铅笔笔迹。They were settling to their work, rubbing down the woodwork with...