他们还证明了黄杉只有一种花色素苷。
They have shown that there is only one anthocyanin in pseudotsuga.
所以，健康的黄杉是不会受到害虫损害的。
So, healthy cedars are unlikely to suffer from the insect damage.
主要结构框架都是由黄杉打造并由装置区外预制定做。
The principal structural frame was made from Douglas Fir and prefabricated off site.
第三个假说是气候的缓慢变化导致了黄杉数量的减少。
The third hypothesis states that gradual changes of climate may be to blame.
目前，科学家提出了几个假说来解释黄杉数量的下降。
Scientists have advanced several hypotheses to explain this decline.
而在那些岛屿上是没有熊的，而黄杉的数量却依然减少。
There are no bears on the islands, yet the islands cedars are still in decline.
那么，我们该如何解释那些因为甲虫侵袭而死亡的黄杉呢？
So, how can we explain those dead cedars that were infected with beetles?
事实上，黄杉树皮的含糖量同棕熊主要使用的野生浆果相差无几。
In fact, the cedar bark can contain as much sugar as the wild berries that are a staple of the bears' diet.
熊有时会扒下黄杉的树皮用以食用，因为黄杉树皮还有很高的糖分。
Bears sometimes claw at the cedars in order to eat the tree bark, which has a high sugar content.
其中一个假说认为黄杉数量下降是由以衫皮甲虫为代表的寄生害虫导致。
One hypothesis is that the yellow cedar decline may be caused by insect parasites, specifically the cedar bark beetle.
第二，虽然熊破坏一些树木，但是他们却不是整个黄杉种群数量下降的原因。
Second, although bears damage some trees, they are not the cause of the over all population decline.
比如，黄杉的树皮和叶子上聚集着一些对于昆虫来说有毒的的强力化学物质。
For example, the bark and leaves of the yellow cedars are concentrated with powerful chemicals that are poisonous to insects.
这个解释的问题在于黄杉相对于其他树种来说其实有更强的抵御害虫侵袭的能力。
Well, the problem with this explanation is these healthy yellow cedars are generally much more resistant to insect infection than other tree species.
在北美西北部整个海岸线上的黄杉数量都在下降，不管是在大陆还是在离岸的岛屿上。
Yellow cedars population has been declining all across the northwestern coast of north America, both on the mainland and on the islands just off the coast.
这种情况是因为甲虫侵袭的是已经受损或者患病的黄杉，这些黄杉没有甲虫也会死去。
In those cases, the beetles attacked trees that were already damaged or sick and what probably dead any way.
很遗憾，我们还是不知道是什么导致了黄杉的死亡。阅读部分没有一个假说可以解释其数量减少。
Unfortunately, we still do not know what is killing the yellow cedar. None of the explanations discussed in the reading is adequate.
黄杉是北美西北部常见的树木。 但是从1880年开始的一个多世纪以来，黄杉的数量在逐渐减少。
Populations of the yellow cedar, a species of tree that is common in northwestern North America, have been steadily declining for more than a century now, since about 1880.
恩，阅读部分忘掉了一个事实，那就是在温暖的海拔低处，黄杉死亡数量比相对寒冷的高海拔地区要多。
Well, the reading passage forgot to take one fact into account. Many more trees are dying in the lower elevations where it is warmer than in the higher elevations where it is cold.
这些变化对黄杉根系产生了影响。以前，黄杉的表面细根是初春开始生长的；而现在却在晚冬就开始生长。
These changes have affected the root systems of the yellow cedar trees: the fine surface roots now start growing in the late winter rather than in the early spring.
整幢建筑共采用了80,000多块手工砖，家具陈设简约大方，设计了抛光混凝土地板和黄杉木质天花板。
Over 80,000 handmade bricks were used in total, and are complemented by other simple finishes including polished concrete floors and Douglas fir timber ceilings.
凡集成胶合木梁材将要暴露在室外天气下，要求产品用防腐剂进行处理，或考虑运用具有天然抗腐烂的木材，如阿拉斯加黄杉木或港口奥福德杉树。
Where glulam beams will be exposed to weather, request a preservative-treated product or consider wood that has a natural resistance to decay, such as Alaska yellow cedar or Port Orford cedar.
凡集成胶合木梁材将要暴露在室外天气下，要求产品用防腐剂进行处理，或考虑运用具有天然抗腐烂的木材，如阿拉斯加黄杉木或港口奥福德杉树。
Where glulam beams will be exposed to weather, request a preservative-treated product or consider wood that has a natural resistance to decay, such as Alaska yellow cedar or Port Orford cedar.
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