One by one, I nailed the rafters atop the stud walls while standing inside the 5 x 8–foot house, alongside the mature tree trunk.

围绕着粗壮的树干，我把椽钉到立柱墙顶部。

youdao

Is this person emotionally mature and centered or still lugging around some trunk-sized baggage?

这个人情绪成熟、以情绪为中心的，还是仍然背着一些重重的(情感)包袱呢？

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Tree houses are buildings constructed among the branches or next to the trunk of one or more mature trees, and are raised above the ground.

树屋是建立在树枝间，或者靠近一株或几株成熟树木树干的建筑，高出地面。

youdao

They followed the fates of seedlings growing around six mature cherries and found that the average distance from the trunk of a recently germinated seed was several metres less than that of seedlings that had managed to establish themselves a few months later.

ECONOMIST: Forests of fear | The