The National Arbor Day Foundation has challenged many cities to earn its "Tree City USA" flag by planting and protecting more trees.

国家植树节基金会向许多城市发起挑战，要求它们通过种植和保护更多的树木来赢得那面“美国树城”的旗帜。

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The national flag rises with the sun every day.

这面国旗每天与太阳一起升起。

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Canada's national flag, a symbol for Canada Day, can be seen everywhere and a lot of people paint their faces red and white, which are Canada's national colors.

加拿大国旗是加拿大国庆日的象征，随处可见。而很多人会把自己的脸涂成红色和白色，这是加拿大的国色。

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The Punjab government has announced a three-day mourning period as a mark of respect for Mr. Singh, during which the national flag will fly at half-staff on government buildings.

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