1·Second, it appears that closely related populations of fishes on both sides of the isthmus are starting to genetically diverge from each other.
其次，地峡两侧紧密相关的鱼类种群似乎开始在基因上彼此分化。
2·North and South American species migrating across the Isthmus now came into competition with each other.
北美和南美的物种迁徙穿过地峡，现在开始互相竞争。
3·THE Central American isthmus is smaller than Texas.
中美洲地峡的面积比美国德州还小。
4·And, to cap it all, climate change-to which the unfortunate Central Americans have contributed virtually nothing-seems to be increasing the ferocity of nature in the isthmus.
总的来说，风气改变——事实是，令人遗憾的中美洲做没什么贡献——看起来是地峡天然的加增残暴。
5·Hank Willis Thomas's "A Place to Call Home" depicts North America and Africa as big black continents joined by an isthmus.
汉克威利斯托马斯的作品“一个名叫家的地方”将北美洲和非洲刻画成了两个由地峡连接起来的黑色大洲。
1·Summary of Background Data. Accurate measurement of morphometric parameters of pedicle isthmus is important for transpedicular procedures.
背景资料分析：对于经椎弓根操作，精确测量椎弓根峡部形态学参数很重要。
2·Conclusions: Unilateral lobe with isthmus resection is safe and efficient for treating thyroid solitary thyroid nodule.
结论甲状腺患侧腺叶加峡部切除术是治疗甲状腺单发结节的安全、有效的理想术式。
3·Methods. In vivo measurements of the lumbar pedicle isthmus were performed on the 3-dimensional subject-based ct models, using custom-developed software in 89 volunteers.
方法：使用定制的软件测量89例经由CT资料制作的活体腰椎弓根峡部三维模型。
4·AF converted to atypical atrial flutter(AFL) in 4 cases, but failed to terminate by ablation. AF converted to typical AFL in 2 cases, and terminated by tricuspid isthmus ablation.
消融术中房颤转为不典型房扑4例，消融未能终止，转为典型房扑2例，消融三尖瓣峡部均成功。
5·The oviduct ampulla and isthmus were composed of mucous layer, tunica muscularis and adventitia.
壶腹部和峡部均由黏膜层、肌层和外膜构成。