这种自行车刹车的可靠性据称达到99.999999999997 %，教授补充道：“在三万亿次试验中，我们只有三次失败。 这不算完美，但已经是可以接受的程度。”
They found the bike brake works with 99.999999999997 percent reliability, and the professor added: 'This implies out of a trillion braking attempts, we have three failures.
你自行车的刹车松了，你最好把它修好。
The brake of your bicycle has come loose. You'd better fix it.
我骑自行车下山到中途刹车失灵了。
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