重复使用七次后酶活力下降到50%。的翻译：Activity dropped to 50% after repeated seven times. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Reused seven times after the enzyme activity decreased to 50%.

Activity dropped to 50% after repeated seven times.

The repetition uses seven enzyme vigor to drop from now on to 50%.

When you re-use 7 times more dynamic dropped to 50 per cent.

Activity dropped to 50% after repeated seven times.