We’ve had too many close calls already (see the documentary Countdown to Zero for details on that).
我们已经有太多类似的呼叫（详细请看倒数到零的记录文献）。
And, as the engines ignite, wait for the countdown to reach zero.
然后，当发动机点火时，等待倒计时数到零。
And, as the engines ignite, wait for the countdown to reach zero.
然后，当发动机点火时，等待倒计时数到零。
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