单词:buffing ochre
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589 、 受迫振动 forcedvibration 590 、 受迫振荡 forcedoscillation 591 、 和谐 harmony 592 、 周转齿轮;行星齿轮 epicyclicgear 593 、 固定夹;台夹 benchholdfast 594 、 固定
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. A new archaeological find may signify one of the great leaps in human cultural and cognitive history. Because researchers have discovered a 100,000-yea
THIS IS AMERICA - Athletes Battle Extreme Conditions in Arrowhead 135 BARBARA KLEIN: Welcome to THIS IS AMERICA in VOA Special English. I'm Barbara Klein. STEVE EMBER: And I'm Steve Ember. This week on our program, we tell you about an extreme winter
Harrowing Minnesota Race Tests Endurance Last year, overnight temperatures plummeted to minus 31 degress Celsius. The year before, minus 37. That year, cyclist Jason Buffington saw one of his friends - a fellow racer - who'd stopped. I came up on Cha