其异极3沟或6沟型花粉与真双子叶植物的3沟花粉的相似是趋同演化的结果。
The similarity of its heteropolar 3- or 6-aperturate pollen to the 3-aperturate pollen of Eudicots might result from convergent evolution.
结论甲状腺手术识别喉返神经的五种解剖标志中，以甲状软骨下角尖(或环甲关节)和甲状腺悬韧带较可靠，其次为甲状腺下极、甲状腺下动脉和气管食管沟。
Conclusion the inferior horn of thyroid cartilage and the suspensory ligament of thyroid gland are most reliable as the anatomical landmarks for recognizing the recurrent laryngeal nerve.
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