proper的副词是什么

副词是properly，中文意思是adv.

正确地;适当地;得体地;恰当地;符合习俗地;真正地;实际上;

例句

When muscles are exercised often and properly, they keep the arms firm and sinewy.

如果能经常正确地锻炼肌肉的话，双臂就会一直结实而强健。