在产品发布前，大量的战略规划都在幕后秘密进行。

A lot of strategic planning happens ___behind ___the ___scenes before a product launch.

这部纪录片揭示了和平谈判期间幕后进行的激烈谈判。

The documentary reveals the intense negotiations that took place ___behind ___the ___scenes during the peace talks.

虽然合并对公众来说似乎很顺利，但幕后却存在一场权力斗争。

While the merger seemed smooth to the public, there was a power struggle ___behind ___the ___scenes.