The beetle attacks mature trees only; its larvae ultimately kill the tree by feeding under its bark.
山松甲虫只寄生于成年树木，它的幼虫会通过取食树皮下的组织最终杀死树木。
2
He could see the beetle under the bark, and draw it forth unharmed for us to squint at through the magnifying glass.
他能看到树皮下的甲虫，并把它毫发无伤地捉下来，放在放大镜下让我们看。
3
The most significant threat to bats is habitat clearance, particularly the removal of the old forest wood where they roost in hollows or under the bark of trees.