whereby：凭借；通过…；借以；与…一致
例句：The company operates an arrangement whereby employees may select any 8-hour period between 6 a.m. to 8 p.m. to go to work.
句意：该公司做出了一种安排，据此员工可以在上午6点到晚上8点之间任意选择8个小时去上班。