其次，你还得留意一个承诺问题：一些旅客原本想静静地呆在车厢，但有时他们会因自己必须接一通重要的电话而发出声响。

Second, there is a commitment problem: noise is sometimes made by travellers who choose the quiet carriage but find an important call hard to ignore.

youdao

其次，你还得留意一个承诺问题：一些旅客原本想静静地呆在车厢，但有时他们会因自己必须接一通重要的电话而发出声响。

Second, there is a commitment problem: noise is sometimes made by travellers who choose the quiet carriage but find an important call hard to ignore.

youdao