白天，酒店的宴会厅充当宽敞的会议厅。

During the day, the hotel's ballroom ___functions ___as a spacious conference hall.

许多现代智能手机可以充当功能强大的数字钱包用于支付。

Many modern smartphones can ___function ___as highly capable digital wallets for making payments.

那个经过翻修的大仓库现在用作一个充满活力的社区艺术中心。

The large, renovated warehouse now ___functions ___as a vibrant community arts center.