Things never stay the same.

翻译：事物不会保持原样

意译：事物不会一层不变

stay“保持……状态”

stay healthy

保持健康

翻译：事物不会保持原样
Stay
解释:Stay [stei]

n. 停留,停止,依靠
v. 停留,留宿,制止
例句
I don't think he's sufficiently dedicated to stay the course.
我认为他不够坚定，不会坚持到底的。
I stayed late at the party last night.
昨晚我在晚会上呆到很晚。
The temperature has stayed hot this week.
本周气温一直都很热。

词形变化:
动词过去式:stayed 过去分词:stayed 现在分词:staying 第三人称单数:stays

名词 stay:
continuing or remaining in a place or state
a judicial order forbidding some action until an event occurs or the order is lifted
the state of inactivity following an interruption
同义词：arrest, check, halt, hitch, stop, stoppage
(nautical) brace consisting of a heavy rope or wire cable used as a support for a mast or spar
a thin strip of metal or bone that is used to stiffen a garment (e.g. a corset)
动词 stay:
stay the same