Update docs-2.0/3.ngql-guide/3.data-types/4.date-and-time.md

Co-authored-by: randomJoe211 <[email protected]>

Author: cooper-lzy

docs-2.0/3.ngql-guide/3.data-types/4.date-and-time.md

@@ -80,7 +80,7 @@
 
 ## DURATION
 
-`DURATION`包含持续时间，由`years`、`months`、`days`、`hours`、`minutes`、`seconds`这六个Key自由组合而成的Map类型数据表示持续时间。例如`duration({years: 12, months: 5, days: 14, hours: 16, minutes: 12, seconds: 70})`。
+`DURATION`是一段连续的时间，由`years`、`months`、`days`、`hours`、`minutes`、`seconds`六个Key自由组合成的Map类型数据表示。例如`duration({years: 12, months: 5, days: 14, hours: 16, minutes: 12, seconds: 70})`。
 
 `DURATION`还有以下特点：