不为0，为0的是重量，This，is，weightless，，here，your，weight，is，double,这里是零重量，这里是二倍重量,这里是正常重量，这里是二倍重量,然后又是新的一轮,自由落体。
g here your weight is normal, here your weight roughly doubles and you go into another free-fall period and the cycle from here to here is about 90 seconds.
在英国，棕色轿车的销售量是黑色轿车销售量的约二倍。
About twice as many brown cars are sold as black cars in Britain.
同一份量的碳，所需要的氧的分量却是一氧化碳的二倍。
For the same amount of carbon, there is twice as much oxygen as in carbon monoxide.
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