proficient
adj
~ (in/at sth/doing sth) doing or able to do sth in a skilled or an expert way because of training and practice 精通的; 熟练的
a proficient driver 开车的好手
proficient in theuse of radar equipment 精通雷达设备之使用的
proficientat operating a computer terminal 善於操作计算机终端设备的.