She seemed to be assisting at a ghastly play in which she was the principal actor.

她好象在看一场恐怖的戏，戏中她自己是主角。

youdao

Makoto Shinkai is a Japanese anime director, animator, and principal voice actor.

新海诚是日本著名的动画导演、动画家和声优。

youdao

And the Office of Management and Budget within the Executive Branch is the principal actor when it comes to assessing these things.

WHITEHOUSE: Press Briefing