久久国产欧美日韩精品,日韩国产精品久久久久久亚洲,99视频精品全部免费免费,91精品国产综合久久走光

只要楊樹枝干上存在損傷,即可引起心材變色,在傷口上接種相關(guān)真菌、細(xì)菌則可使變色加重.It'should aggravate core stain if poplars were inoculated by relative fungus and bacterium in cut....

“使變色”的英語可以翻譯為：distain ...