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Patients undergoing coronary bypass surgery need implants of new, healthy blood vessels. So do those who receive repeated hemodialysis due to kidney failure. The best option is to use the patient's own veins or arteries, but thousands of patients don

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00:01.65]第19单元 [00:03.29]Food and drink [00:05.02]食物和饮料 [00:06.74]Lesson 73 [00:08.48]第73课 [00:10.21]1 Read and say [00:12.50]1 读和说 [00:14.79]LILY:Hello,Han Mei!You have a watch.What time is it? [00:17.36]LILY:喂,韩梅!你看一下表.几点了?

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