For example, did you know that 1 in 4 teenagers has tried marijuana?
比如,你是否知道4个青少年中就有1位曾经吸过大麻?
In 1953, a former electronics engineer in his fifties, Christopher Cockerell,who had turned to boat-building on the Norfolk Broads,
在1953年,有一位50多岁名叫克里斯托弗·科克雷尔的原电子工程师,改行在诺福克郡的湖泊地区从事造船业,