For example, the bark and leaves of the yellowcedars are concentrated with powerful chemicals that are poisonous to insects.
比如,黄杉的树皮和叶子上聚集着一些对于昆虫来说有毒的的强力化学物质。
2
Well, the problem with this explanation is these healthy yellowcedars are generally much more resistant to insect infection than other tree species.
这个解释的问题在于黄杉相对于其他树种来说其实有更强的抵御害虫侵袭的能力。
3
Yellowcedars population has been declining all across the northwestern coast of north America, both on the mainland and on the islands just off the coast.