2 sentences

1. 信用卡号码无效。

   xìn​yòng​kǎ hào​mǎ wú​xiào.

   The credit card number is invalid.

   Source: CCMatrix

2. 一种治疗可能对一个孩子有效，但对另一个孩子无效。

   yī​zhǒng zhì​liáo kě​néng duì yī​ge hái​zi yǒu xiào, dàn duì lìng​yī ge hái​zi wú​xiào.

   A treatment may work for one child but not for another.

   Source: CCMatrix