zhè / jiàn / shì / ràng / tā / jué / de / hěn / biē / qū / què / yòu / bù / zhī / dào / gāi / xiàng / shéi / jiě / shì

这件事让他觉得很憋屈，却又不知道该向谁解释。

This situation made him feel terribly frustrated, yet he did not know whom to explain himself to.