It was very dramatic and a lot of pressure to get it in one take.

这是非常戏剧化的，而且这场拍摄要一次搞定，就有很大的压力。

The expression " to get it in one" (one) means to guess something correctly the first time – not to need another guess, to get it right on the first attempt.

“to get it in one” （一个）这个表达方式意味着第一次就猜对了——不需要再猜一次， 第一次尝试就猜对了。