What's the meaning of "pre-launch"?

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What''sthemeaningof"pre-launch"?What''sthemeaningof"pre-launch"?What''sthemeaningof"pre-launch"?发射前的,下水

What's the meaning of "pre-launch"?
What's the meaning of "pre-launch"?

What's the meaning of "pre-launch"?
发射前的,下水前的