那棵老橡树粗大的树干为整个花园提供了荫凉。

The massive ___trunk of the old oak tree provided shade for the entire garden.

一只松鼠顺着树木粗糙的树干径直跑了上去。

A squirrel ran straight up the rough bark of the tree's ___trunk.

森林里长满了参天大树，它们的树干像柱子一样伸向天空。

The forest was filled with towering trees, their ___trunks rising like pillars towards the sky.