使忙于,使从事于:
be occupied in doing sth
be occupied with sth
occupy oneself in doing sth
occupy oneself with sth
occupation名词,占领,职业．
使忙于,使从事于:
be occupied in doing sth
be occupied with sth
occupy oneself in doing sth
occupy oneself with sth
occupation名词,占领,职业．