They have heavy and straight tree trunks.

牠们有又重又直的树干。

youdao

They jab tree trunks to toughen their hands and practice squatting with other students sitting on their shoulders to build the leg strength.

他们猛击树干来锻炼双手，练习蹲坐，让其他同学坐在他们的肩膀上锻炼腿部力量。

youdao

Tie the laces together, stretch them between two tree trunks, tie them around and hang the plastic over, like a tent.

把鞋带连在一起，绕过两棵树系起来，把塑料布放在上面，像一个帐篷。

youdao

Corals have hard, stony skeletons that grow like tree trunks.

VOA: special.2009.05.12

And these tree trunks were the chords and at the base of each of these chords at least conceptually, theoretically, is this thing called the root.

这些树干就是和弦，而每个和弦的底部，从理论上说，就是被称为根的东西。

耶鲁公开课 - 聆听音乐课程节选

One of the things that we discussed was this type of imagery here where you have vertically these pillars, if you will, or we could even call--the more I sort of looked at this--sort of call them tree trunks almost.

我们讨论的问题之一是这里的这种意象，这些垂直的柱子，如果你愿意的话，我们可以称之为，我越看越觉得称之为树干比较好。

耶鲁公开课 - 聆听音乐课程节选

We know how easily these splendid woodpeckers hop around tree trunks to stay out of sight.

WSJ: The Brains of the Animal Kingdom

Together they sewed woollen panels over pieces of public art, fences, benches and even tree trunks.

BBC: Knitters transforming Newcastle's public spaces

Kon-Tiki itself was made of nine balsa would tree trunks lashed together with hemp rope.

CNN: The Kon-Tiki: Crossing an ocean on balsa