Whereas the region's native evergreen pines shade the snow and absorb radiation, birches would shed their leaves in winter, thus enabling radiation to be reflected by the snow.

然而那个地区当地的常绿松树可以为雪遮阴，吸收辐射，而白桦树在冬天则会落叶，从而使辐射被雪反射。

Higher up were forests of white birches.

再往高处去就是一片片白桦林。

Higher up were forests of white birches.

再往高处去就是白桦林。

When I see birches bend to left and right.

当我看到白桦树弯下身子，向左，也向右。

The crag of birches running the sky's gray.

一排桦树在灰色天空下闪过。

The trees were silver birches, four of them.

树是银色树皮的桦树，一共四棵。

Birches and oaks feathered the narrow ravines.

桦树和橡树密生于狭谷中。

One could do worse than be a swinger of birches.

人能做的事，比荡白桦树好不到哪去。

The Nordic birches have long been of special interest.

北欧的桦树很久以来就特别引人注目。

Under the hoarfrost the slightest twig of birches is white.

在霜下桦树的最轻微的枝是白色的。

To this day the old stump is surrounded by three slim birches.

从这天开始，老树干就被三棵纤细的小白桦围绕着。

The little birches grew fast, and their life was carefree and happy.

小白桦们迅速地成长着，她们过着快乐无忧的生活。

I find these erect white birches look like soldiers standing guard.

感觉这一棵棵秀丽挺拔的白桦树就像一个个肃立的卫士一样。

I admire the wildflowers, 30 cedars and 31 birches that fill the forests.

我钟爱遍布树林的野花、雪松和白桦树。

Just looking at this first line: "When I see birches bend to left and right."

看第一句：，当我看到白桦树弯下身子，向左，也向右。

Search for the legendary cascades that monster and birches in the mountain;

探寻传说中的喀那斯水怪和山中的白桦林；

So was I once myself a swinger of birches. And so I dream of going back to be.

我过去就是这样一个荡树的孩子现在，做梦都想回到那种日子。

Researchers have found similar responses in sugar maples, birches and other trees.

研究人员在糖槭树、桦树等其他一些树木上也发现了类似的反应。

The hickories, birches, chestnuts, no less than the maples, have lost their leaves.

山核桃、白桦树、栗树与枫树一样，都掉光了叶子。

The rich bottom land near the river was studded with tall sycamores, birches, and box elders.

肥沃的河滩地上散布着高大的美国梧桐、白桦树和白蜡槭。

The broad-leaf trees are members of flowering plants, including the oaks, elms, maples, birches, and beeches.

阔叶树属于显花植物，包括橡树、榆树、枫树、枞树和桦树。

It was early May. In some of the gardens the fruit trees were encircled with dense clusters of daffodils. The birches were already in pale green leaf.

此时正是五月初，有些花园里的果树上密密地缠绕着束束水仙，桦树的树叶已呈暗绿。

Let's illustrate these general points by just reading together and trying to hear the beginning of Robert Frost's poem "Birches," on page 211 in The Norton.

让我们解释这个笼统的观点通过一起读诗,尝试去听罗伯特·弗罗斯特的诗“桦树“,在211页，诺顿。