是slower

adj. 较慢的慢一点的（slow的比较级）

v. 减慢

Could you go a little slower?

你能走慢点吗

Progress was slower than expected.

进展比预计的缓慢。

The train went slower and slower until it stopped altogether.

火车愈来愈慢，最后完全停了。I felt my heart beating faster.

我感觉心脏跳得更快了。