我用两个句式造句就清楚了
一谈起英雄,人们最早想到的是雷锋.
Whenever we mention about hero,Leifeng is the first one we think of.
一谈起地震,我们最早想起的就是唐山大地震
whenever earthquake was mentioned ,the first thing burst into/come to our mind is earthquake in Tangshan.
一般用被动用法 被谈起 mention 不用about.