2 sentences

1. 我做了个小小的背景调查。

   wǒ zuò le ge xiǎo​xiǎo de bèi​jǐng​diào​chá.

   I did a little background check.

   Source: AI Challenger 2017

2. 许多日托中心对潜在员工进行背景调查，看看他们是否有犯罪记录。

   xǔ​duō rì​tuō zhōng​xīn duì qián​zài yuán​gōng jìn​xíng bèi​jǐng​diào​chá, kàn​kan tā​men shì​fǒu yǒu fàn​zuì jì​lù.

   Many daycare centers conduct background checks on potential employees to see if they have criminal records.

   Source: CCMatrix