4 sentences

1. 他趁机溜走了。

   tā chèn​jī liū​zǒu le.

   He took the opportunity to slip away.

   Source: Dong Chinese Dictionary

2. 我想他在你们进来时溜走了。

   wǒ xiǎng tā zài nǐ​men jìn​lái shí liū​zǒu le.

   I think he slipped out when you guys came in.

   Source: OpenSubtitles

3. 他趁没人注意时从后门溜走了。

   tā chèn méi rén zhù​yì shí cóng hòu​mén liū​zǒu le.

   He slipped out the back door when no one was looking.

   Source: Dong Chinese Dictionary

4. 他只能眼睁睁地看着机会从指缝中溜走。

   tā zhǐ néng yǎn​zhēng​zhēng de kàn zhe jī​huì cóng zhǐ​fèng zhōng liū​zǒu.

   He could only watch helplessly as the opportunity slipped through his fingers.

   Source: Dong Chinese Dictionary