定位讨论帖的问题，请教大家

Away90

刚连着发了好几个问题，其实我也知道网上有讨论帖，可是进去后发现题目都不一样，问一下大家，比如：T-9-Q39.987-675，我的题目是Studies show that young people with higher-than-average blood pressure and their families have a history of high blood pressure are more likely than others to develop a severe form of the condition.

可是我找到的帖子是：天山-9-39
The greatest road system built in the Americas prior to the arrival of Christopher
Columbus was the Incan highway, which, over 2,500 miles long and extending from
northern Ecuador through Peru to Southern Chile.


天山-9-39
The greatest road system built in the Americas prior to the arrival of Christopher
Columbus was the Incan highway, which, over 2,500 miles long and extending from
northern Ecuador through Peru to Southern Chile.


大家是怎么搜的讨论帖，而且大全基本是885的，没看到987的标志。
抱歉，问得问题很菜鸟。。。