登山者 / 出现 / 呼吸困难 / 时 / 队医 / 立即 / 检查 / 了 / 他 / 的 / 血氧量登山者出现呼吸困难时,队医立即检查了他的血氧量。When the climber had difficulty breathing, the team doctor immediately checked his blood oxygen level.