业余: in one's spare time, outside working hours, amateur (historian etc)...
朝气蓬勃: full of youthful energy (idiom); vigorous, energetic, a bright spark...
重申: to reaffirm, to reiterate...
尺: a Chinese foot, one-third of a meter, a ruler, a tape-measure, one of the three acupoints for measuring pulse in Chinese medicine...
