2 sentences for 国门 (guó​mén)

1. 海关人员坚守在保卫国门的第一线。

   hǎi​guān rén​yuán jiān​shǒu zài bǎo​wèi guó​mén de dì​yī​xiàn.

   Customs officers stand at the front line of defending the nation's borders.

   Source: Dong Chinese Dictionary

2. 大军凯旋，在国门外受到百姓的热烈欢迎。

   dà​jūn kǎi​xuán, zài guó​mén wài shòu​dào bǎi​xìng de rè​liè huān​yíng.

   The army returned in triumph and received a warm welcome from the people at the city gates.

   Source: Dong Chinese Dictionary