They’re reading an article about a fund-raising event _ (call) Trailwalker.

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They’rereadinganarticleaboutafund-raisingevent_(call)Trailwalker.They’rereadinganarticleaboutafund-r

They’re reading an article about a fund-raising event _ (call) Trailwalker.
They’re reading an article about a fund-raising event _ (call) Trailwalker.

They’re reading an article about a fund-raising event _ (call) Trailwalker.
called
动词分词做形容词表示被动
这个活动被叫做 trailwalker

it calls

called