笔直地
Bolt \Bolt\, adv. In the manner of a bolt; suddenly; straight; unbendingly. [He] came bolt up against the heavy dragoon. --Thackeray. {Bolt upright}. (a) Perfectly upright; perpendicular; straight up; unbendingly erect. --Addison. (b) On the back at full length. [Obs.] --Chaucer.