Because the birch tree is just starting to leaf, tradition as single women finding a birch branch nailed to their side of the house from their secret admirer.

由于桦木树刚开始叶子，为寻找比尔克·布兰奇钉从他们的秘密仰慕他们的房子边单身妇女的传统。

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Compared with natural secondary forests of birch, Dahurian birch, and broadleaf tree mixed one, larch plantation showed higher sluice function due to its higher canopy interception percentage.

结果表明，落叶松人工林的林冠截留率最大，表现出比天然白桦林、天然黑桦林和天然阔叶混交林具有较强的蓄水和拦截功能。

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I'd like to go by climbing a birch tree, And climb black branches up a snow-white trunk toward heaven, till the tree could bear no more, But dipped its top and set me down again.

我真想去爬白桦树，沿着雪白的树干，爬上乌黑的树枝，爬向那天心，直到树身再支撑不住，树梢碰着地，把我放下来。

耶鲁公开课 - 现代诗歌课程节选

Mr Holden is from a one-horse town, Birch Tree, while his opponent, Jim Talent, is from the St Louis sprawl.

ECONOMIST: America��s focus group

Delegates walking past the Brighton Centre were surprised to be handed the gift of a sapling silver birch tree in a bag.

BBC: TODAY'S AGENDA

The first step is figuring out how much sap can be extracted from the average birch tree in the Northeast using modern practices, she said.

WSJ: Birch syrup explored as add-on to maple industry