2 sentences

1. 反应时间是个因素。

   fǎn​yìng shí​jiān shì gè yīn​sù.

   Reaction time is a factor.

   Source: OpenSubtitles

2. 这台仪器的反应时间缩短到了纳秒级别。

   zhè tái yí​qì de fǎn​yìng shí​jiān suō​duǎn dào le nà miǎo jí​bié.

   The response time of this instrument has been reduced to the nanosecond level.

   Source: Dong Chinese Dictionary