Once time has gone by, it will never return.
时间一旦消逝，就永不再回来了。
Time is precious. Nobody can afford to waste time. Once time has gone by, it will never return.
时间是宝贵的，没有人能浪费得起时间，一旦时间流逝后，再也不会回来了。
Big Ben has rarely gone wrong. Once, however, it failed to give the correct time.
“大本”钟很少出差错。然而有一次，它却把时间报错了。
Big Ben has rarely gone wrong. Once, however, it failed to give the correct time.
“大本”钟很少出差错。然而有一次，它却把时间报错了。
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