垫YOnGSHIJiaoyU.CN 在线汉语字典脚石diàn jiǎo shí
1. 供步行时踏脚的石头(如过小河时)
英:stepping-stone;
2. 比喻被别人借以向上爬的人或事物。
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◎敲门砖qiāoménzhuān
[a brick picked up to knock on the door and thrown away when it has served its purpose—a stepping-stone to success] 拣砖头敲门,门开后即弃…