They start to lay eggs when they are nine months old.
出自-2014年6月听力原文
I've been looking for a suitable place since I got here six months ago.
出自-2013年6月听力原文
The average amount of time students now take to complete an undergraduate degree has stretched to six years and seven months as students interrupted by work, inconvenienced by unavailable classes, or lured by one more football season find it hard to graduate.
出自-2012年6月阅读原文