n.环状物...

annulation的音标：annulation的英式发音音标为：[ænjʊ'leɪʃən]annulation的美式发音音标为：[ænjʊ'leɪʃən]...

Result: A new type fiber - annulation thickening on intracavitary cell wall, was discovered in medical material power.结果: 在药材粉末中发现一种新型纤维 — 其腔内细胞壁环纹增厚....