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）。

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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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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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