2 sentences

1. 改用b计划。

   gǎi​yòngb jì​huà.

   Switch to Plan B.

   Source: OpenSubtitles

2. 为了环保，很多餐厅已经改用纸质吸管。

   wèi​le huán​bǎo, hěn​duō cān​tīng yǐ​jīng gǎi​yòng zhǐ​zhì xī​guǎn.

   Many restaurants have switched to paper straws for environmental reasons.

   Source: Dong Chinese Dictionary