One is to " thumb (thumb) a ride" .

一是“拇指（拇指）搭车”。

" To thumb a ride" means to hitchhike.

“搭便车”是搭便车的意思。

To put it another way, they are trying to thumb a ride through life-and the parade passes them by.

换句话说，他们正试图在生活中兜风——而游行却从他们身边擦肩而过。