船因逆潮而慢下来.The ship was slowed down by counter tides.鱼又慢下来了,正用它惯常的速度游着.The fish had slowed again and was going at his usual pace.它们的进化速度看来确实是慢下来了.Their evolutionary rate does seem to have slowed down....

“慢下来”的英语可以翻译为：slow up，slow down ...