a.考虑周到的,体谅的
considerable [kn'sidrbl]
adj great in amount,size,importance.
相当多（大,重要）的.
The project wasted a considerable amount of time and money .哪项工程耗费了相当大的时间和金钱.
considerate:
adj always thinking of other people's wishes and feelings;careful notto hurt or upset others.
考虑周到的,为他人着想的,体谅的,体贴的.