这种疫苗是专门为对抗流感病毒设计的。

This vaccine is specifically designed to be ___for the flu virus.

他提前预定了座位，以确保有个好位置。

He made a ___booking to secure a good seat.

父母警告他不要过度沉迷游戏。

His parents warned him not to ___indulge in video games.