Eventually they either become part of the original tree trunk or become separate tree trunks.

最后，它们要么长成原有树干的一部分，要么长成独立的树干。

The orchid species grows on tree trunks above altitudes of 1600-1700 meters.

这种兰花生长在海拔 1600 至 1700 米以上的树干上。

In the kitchen, for sure, I saw that tree trunks came into the apartment.

在厨房里，我确确实实看到有树干倒进了公寓。

What about having him sitting on the tree trunk on the right of the picture?

把他画成坐在画面右边的那棵树干上怎么样？

It developed black wings, so that it was invisible when it settled on soot-covered tree trunks.

他们进化为黑色翅膀，甚至当他们栖息在煤烟覆盖的树干时以至于能够达到隐形效果。

Like most primitive dogs, it makes its den in the ground or in hollow tree trunks.

和大多数的野犬一样，它们把洞穴建在地下或者树洞中。

Scientists are able to gather some climate information from other materials, such as tree trunks, for example.

科学家能够从其他材料（例如树干）中收集一些气候信息。

Some people think the stones were rolled on tree trunks, or dragged in huge baskets pulled by oxen.

有些人认为石头是被放在树干上滚装前进或者在一个巨大的篮子里被公牛拽着人力拖行。

As you can imagine, the tree trunk bursting with sap is a strategic attraction for many insects.

你能想象出来树皮里丰富的树液对很多昆虫来说是难以抗拒的诱惑。

Lead researcher Natalie Briscoe said there is a five-degree difference in temperature between a tree trunk and the air.

首席研究员娜塔莉·布里斯科说，树干和空气之间有5度温差。