eucalyptus
noun [ C or U ] uk/ˌjuː.kəlˈɪp.təs/ us/ˌjuː.kəlˈɪp.təs/ (also eucalyptus tree); (also gum tree)
（尤指产于澳大利亚的）桉树
any of several types of tree, found especially in Australia, that produce an oil with a strong smell. Eucalyptus oil is used in medicine and industry.
eucalyptus oil 桉树油