exotics的意思？

exotics的音标：exotics的英式发音音标为：[ɪg'zɒtɪks]exotics的美式发音音标为：[ɪg'zɒtɪks]...

Tree planting is almost automatically confined to exotics.树木栽植几乎主动地局限于外来种.Exotics are most useful in regions in which the native flora is deficient.在当地植物种类贫乏的地区,外来种最为有用....