每年复活节后的第一天，举行这种活动，当天，白宫的大门洞开，欢迎小朋友们到白宫南草坪滚彩色复活蛋。
This event is held every year on the day after Easter. On that day, the White House opens its gates and welcomes children to roll Easter eggs on the South Lawn.
《老城车站》车站的大门就是古老的城门洞。
The station of the old city the front gate of the station is the old door opening.
穿过这个门洞就可以看到故宫的大门了。
After passing through the doorway, you can see the gate of the Forbidden City.
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