// Component: this.coursesTotal = this.course,length
<div i18n>{coursesTotal, plural, =0 {No course in available.} =1 {One course is available.} other {A total of {{coursesTotal}} courses are available.} } </div>
[Angular] Angular i18n Pluralization Support
原文：https://www.cnblogs.com/Answer1215/p/10356360.html