Results There are secretory nodule and secretory cavity(canal), two secretory structures different in the character of morphology, in herbs, but there is only secretory cavity(canal)in xylophyta.
结果存在分泌细胞团和分泌囊（道）二类形态结构特点不同的分泌结构，草本植物中两者都有，而木本植物中只有分泌囊（道）。
Conclusion Low power microwave radiate in external acoustic canal treatment of acute secretory otitis media is useful, painless and no side effect.
结论低功率微波耳道内辐射治疗分泌性中耳炎，疗效显著，无痛苦，无副作用。
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