ABC潘玮柏教学地道日常口语 Unit15

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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Are your car bumpers riddled with scars from encounters with tight parking spaces? Did the furniture movers scratch your floor? Wouldn't it be great if t

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SSS 2010-01-19

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Explanation: In the United States, military service (or the time spent working in the army) is voluntary (or optional and something that one chooses to do). Under normal conditions, no one has to serve in the army if he or she doesnt want to. However

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Whether it is mathematics or history, almost everyone has at least one subject they find to be more difficult to understand than other subjects. Some students may not be strong academically, lacking the skills they need to succeed in writing or takin

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SSS 2008-09-01

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SSS 2011-02-07

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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