The main causes of the death of one fetus in twin pregnancy were cord elements(5 cases), fetal deformity(3 cases), velamentous insertion(4 cases)and unknown etiology(15 cases).

双胎之一胎儿死亡主要原因：脐带因素5例、胎儿畸形3例、帆状胎盘4例、原因不明15例。

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The Twin Active Subs reflect the synergistic advantage of integrating electronic and acoustic elements into one package.

替补的双主动反映融入一个封装电子和声学因素的协同优势。

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Extrusion rate, melt pressure, flow profile and mixing effects of the conical twin screw with mixing elements were observed experimentally.

对混炼型锥形双螺杆的挤出产量、物料压力、物料流动状态及混合效果进行了大量实验研究。

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Today, more than two decades later, the city's streets lie overgrown, and schools, apartments and shops crumble under the twin onslaught of time and the elements.

BBC: A day trip to Chernobyl