【正确答案】What is great (extraordinary) about doctors is their ability to relieve (ease/alleviate) the pain (suffering) of patients. Not only do doctors (have to) have close contact with various patients, but try to achieve the best effect at the minimum (lowest possible) expense (cost). The popularization (improved availability and accessibility) of new technologies and facilities can help doctors treat effectively life-threatening diseases (that pose a threat to life). Like researchers, doctors have to keep themselves informed of the latest development in their sphere of study (research).