springboard

n 1 strong flexible board from which a person can jump high before diving or performing a gymnastic feat （跳水运动的）跳板; （体操运动的）踏跳板. 2 ~ (to/for sth) (fig 比喻) starting point that gives impetus to a future activity 发展事业的起点: The college debating society was a natural springboard for her career in politics. 大学里的辩论社自然成了她从政的垫脚石.

sprawl, spray, spray-gun, spread, spread eagle, spread out, spread-eagle, spreadsheet, spree, sprig, sprightliness, sprightly, spring, spring balance, spring chicken, spring greens, spring onion, spring up, spring-clean, spring-tide, springbok, springiness, springtide, springtime, springy, sprinkle, sprinkler, sprinkling, sprint, sprinter, sprite, sprocket, sprout, spruce, sprucely, spruceness, sprung, spry, spryly, spryness,