为了安全，开车的时候必须系安全带。

Wèile ānquán, kāichē de shíhou bìxū jì ānquándài.

For safety, you must wear a seat belt when driving.

做决定前，我们有必要先听听大家的意见。

Zuò juédìng qián, wǒmen yǒu bìyào xiān tīngting dàjiā de yìjiàn.

Before making a decision, it is necessary for us to first listen to everyone's opinions.